I don't know if anyone has ever questioned the motives or reasons behind the classes in BDO so I wanted to ask any question and give my opinions. I believe that there is a meaning much deeper and darker behind it. BDO is a South Korean game with customization in mind let's focus on what BDO  advertises. Let's start with

1. Warrior - is the typical melee in most games, but in BDO the advertisement and main look for the Warrior class is a kind of Western look.  the typical view of a Caucasian male with blond hair we can conclude that. The Origins of Warrior is a Western Adventure. let's say his from a country in the EU with the most warriors/knights. English & France

2. Ranger/Archer - is the typical range class that uses a bow and dagger, in BDO based on her advertised appearance she has the western look of a Caucasian female with typical blonde hair. Let's say the Origin country for her English, French with that Celtic old style.

3 Novas, Valkarys, Dark Knights- they are like the tectonic knights their appearance is Caucasian with a paler tone same typical blonde/red hair, black, and they give the air of a Northern Polan/Holy Roman empire-type vibe, again Origins Western look EU countries. 

4. Guardians/Berserker - Western for the Northern parts of the EU like the Scandinavian/germanic Norwegian  Viking/Celtic looking vibe and appearances.. the typical savage barbarian.

Wizards, Witches, and sorcerers are the typical Magic classes in most games and like the previous classes, their Origins by looks are Caucasian with blonde hair. 

Sage. He's caucasian from Greece he's a Greek lol

Corsier- Pirattes, she from Spain lol 

Drakania- hmm 

With this, we can conclude that by the advertisements and looks that BDO used for these above classes they got their reference from the Western European countries.

5. Tamer. is a class that in BDO is kind of a disappointment because it is not really what the name actually supposed to be. but let's talk about the Origins by the looks and appearances it can be said that she is the shortest/smallest body type and by her looks. the tamer is an Asian class that can be associated with Vietnam, Cambodia, and Bhutan.

6. Lahn- nothing much to say about this one. Asian country China. typical black hair

7. Musas, Mewhas, Wossa, Megus - Nothing much to say about them either it's obvious that they are Korean-based classes. typical black hair Asian features

8. Striker & Mystics can be said that by the looks and feel  their origins are a mix of Russian and Asian martial artist 

9. Ninjas and Kunoichi - Origins and mostly known as a Japanese class. Asian typical looks and features.

Now we can conclude that the classes mentioned above are of Asian Origins

10 Hashashin. even the name says it all originates from Middle Eastern countries Persia, Syria, and Turkey. it's the only class that has as advertised and used as a promo a skin tone that is different than the rest. representing the only class with dark skin in BDO.

11. Shai is just cute!

12. Scholar- Irish and red hair lmao ....even her name Eibhlin O'Cearbhaill......LMAO ..........................O'

Classes from different origins are obvious to the public in a Koren Game intentionally specifying their country of origin. it tells a lot about the mindset when making them. BDO used to have hidden stats before. BDO nerfs classes randomly trying to make players happy or trying to make the game fair and with all my 7 years I can say the game classes are nothing close to fair, and that makes me wonder do the origins of the classes have anything to do with this unfairness. Class fairness is when all the classes have the same stats and the same numbers in the damage and buffs. Now if you want to say "Different classes have different play styles" I will say that's not a reason to have different stats and different damage and defense numbers. This is a game, not real life and if anyone wants to go by real-life standards then you will have a really unfair unbalanced game. for example, pit a Ninja against any class with the same damage and stats that's a fair game! now do the same with real-life standards all the ninja has to do is poison the hell out of any class and just sit back and relax. so what's the reason for all the different stats numbers? Hey maybe is a Country of origin thing or does BDO have biased creators/developers,  who knows, but I can say that if you are going to make a game with different classes corresponding to different regions based on planet Earth then 1 you are still missing 2 major regions and its super obvious and those are South America and Africa. but hey what am I saying this is a KOREAN GAME! 

Who am I am just a player that has been playing BDO for 7 years and this is my opinion of the classes in the game. I main a LV 66 Ninja. 

I'm very confused. What's your point OP?

Read the title. read the rest, and if you are still confused, well sorry I can't help you with the lack of your understanding.

As far as i understand you think class balance has something to do with class archetype? While i don't know for sure it's most likely influeced by playtime/user numbers/sieges/nodewars and other metrics. They surely keep stats of a lot of things in the background and they clearly don't care about where a classes origin is inspired from. 
If anything new classes are always op in some form. The foxlady succ clears extremely well in pve. 

Let's put it in the way you say u understand. 

European classes = 14

Asian classes = 10

Middle Eastern= 1

Americas = 0

Africa = 0

Some classes do get buffed more than others and yes this game is still unbalanced because people keep trying to get their favorite class buffed and not nerf. The solution to that Same skill stat number for all classes. simple and easy. 

Stats don't need to be adjusted to class play style because then the game will have to deal with the issue of players complaining about their favorite class and if PA tries to please the player base on preference the game just become unfair.

Based on preference Korean classes are the way to OP no matter if it's the new class. Musas are still one of the strongest classes in the game not to mention others  and it's not even a hard class to control it is super easy, 

Now compare it to Ninja which can be said to be a skill-based class or if not the hardest class then yeah it is unbalanced so based on your understanding of not being sure, the most played class should get buff while the less played class should get nerf or no to lil change.?

if the buff and nerfs are based on the complaints and like of the players then PA is not being fair. 

In my experience of 7 years, the difficulty of classes' play style is easily distinguishable most European classes are easy to control with lil skill need, only the Sorceress  is  Difficult to learn 

 On the Asian side, the Ninja and Kunoichis, and Tamers are the Difficult ones and they are Japanese classes 

Now I dare you to do your homework and look thru all the updates that BDO has had and look and count what classes have gotten the most buffed and the ones that have gotten less. and you will see the disparity and ask yourself why?

BDO can be said to have skilled-based demand classes. and stats are different for each... does PA caters to players from different regions, I don't know. are they trying to maintain a fair balance game it doesn't look like it. 

I say let all the skill stats numbers be the same for all classes. 

OP you missed Drakania :P

Anyway, I do not really buy your theory of classes being intentionally kept underpowered due to the fact that their poster character look looking somewhat close to specific ethnicity.

LOL yes, I did miss Drakania, well I guess you really do not understand marketing and that's fine, I also think you don't understand Asian cultures or let's say Korean Culture, and that ok too.... now let's say people are ignorant about the tricks of marketing to a specific demographics ...why then so many classes promoted with distinctive features. why didn't they advertise in their promos all the classes with Black hair and black eyes? why would you make 1 class with a specific name like HASHASHIN  that is literally its the same as an assassin or let's say the definition of a NInja .....

I have been playing this game for 7 years and I have read all the Updates and changes to classes, Do your homework, look up all the updates and see all the changes to the classes throughout the years and look who has gotten nerfs and buffed the most and why?  is it not because  PA catering to players that complain about one class being too op or their favorite own class being too weak?

Here I will tell you a joke I heard. and if people take it as offensive is not meant to be, is for information purposes 

"Do you know how there is a dark skin tone class in BDO from the Middle East?"

"Because in BDO  and Arab Prince that plays BDO said I will give you 1 mill $ if you make a class from my region" and Boom now we have Xersis from 300 playing as a Hashashin!"

Now if you want to ignore the obvious... then I can't do anything about it that's your choice

But I will say this the gaming industry or let's say developers and game creators are humans with feelings, dislikes, and their own kind of biased ideas and preferences, and selfishness. 

If the BDO is a Korean Game made by Koreans, with Classes that in their names  pretty much say where the origins is from like 

Musa, Wosa, Mewha, Megu, I don't care if others are ignorant or chose to ignore the fact that  does are specific Korean

Ninja, Kunos everyone knows that the ones that are stereotypical  and were it most its famous is a specific Japanese Name

Hashashin  is Middle Eastern 

and the rest can be said that they are European and am not saying that other places don't have witches or wizards etc.. they do but in this game, they are represented as Europeans!

So please don't come here and say they are not ethnically represented!

Come on If you love the game at least do your research.

Incidentally, the fact that Pa follows Archer/Stereotype in character design has less significance in terms of their "marketing strategy" , but which sells better due to user behavior, preferences and gaming activity. Practically in every computer game (racist) stereotypes can be found. ^^Pa didn't invent to make money out of it. The PLayer and game behavior shows, what Pa can sell better -not the other way around

I'm very aware of how companies use the various possible stereotypes, for example in character design. And of course you can find at least one stereotype for every "avatar" in Bdo. But all in all though, Pa is doing a really good job here. Apart from the fact that female gender is overrepresented (which in turn suggests a statistical preference of players) and classic characters like warrior, magician etc. correspond to the stereotypes, there are a multitude of classes that have abilities/skills that does not suggest on theirs ethnological affiliation or gender. I even think the gameplay of the corresponding class design follows a certain logic, including historical background: eg ninjas or tamers are fast "trained fighters" which therefore require a high apm. Although Tamer is portrayed as a very childlike, young, petite woman, she also has a high APM and takes practice to master and not portrayed as a beginner class.

I therefore believe that Pa is influenced by stereotypes when it comes to character design, but not in way i would blame. 
However, guess its more up to feedback, preference, gameplay and probably many more factors are decisive how a class is buffed/nerfd.