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.