Minus your last request regarding increased failstacking, I do believe all of these points are in the edits of the post. Still, I am glad to see you post them because it really does show how meaningful this would be for all of us.

Increased failstacking disregards their intentions, so it's clear they wouldn't do it. However, the other recommendations increase the frequency in which you can make these attempts. That should provide some relief.

Speaking of fern roots. Please give us the possibility of choosing a different way to complete the daily.

Artisan: a) Catch t3 horse or b) Catch 3 horses

Master: a) Catch t4 horse or b) Catch 4 horses 

etc. Depending on RNG of where a specific tier spawns is unncesarily annoying. And if you tell me:

"Oh but that would barely leave horses in the spawns!" Sounds like horse spawn rate should be lowered.

"Finding a specific tier is not that hard." As master, there are times where I've gone to ALL spawns in Mediah and have not found one. Forcing me to go to Duvencrune for a guranteed one. and ride back to give in the quest. (Talk about 30-40m in total.) Specially bad during Training events cause Duvencrune is ALWAYS empty.

🌿 Give us more way to obtain Royal Fern Root or Dreamy Powder

As Zeroden already mentioned, diving deep in making a 🍂 Mythical Horse is something what not every people would do. It is a very-very expensive ride and requires a lot of patience in a long run (except if you are lucky enough). Those who are dedicated to do this are already turned a huge amount of money into something which isn't really a "game changing" feature. Let's be honest, Pearl Abyss has made the progress pace in the game faster in the recent months in many terms and ways, so I can't see the point of making such a huge limitation for us in this cause.

Tapping a PEN item for example (or getting one) is something what we can do in many ways and we've never was so drastically "limited" in that like we are in getting a T10 horse - and the reason is the amount of Royal Fern Root we can get and the way we can. Pearl Abyss keep giving us more and more chance and new ways to get better gear and more money. How GS changes on what and how you experience in/the game and how a T8 - T9 - T10 horse do is totally different thing.

I'd suggest you to give us more options to obtain Royal Fern Root. 
1. ) Giving failstacks is something which sounds fair, yet it looks like that the idea most likely sentenced to death anyways.

2.) Give us more quests to complete for extra Royal Fern Roots (or Dreamy Powders). One of my simple ideas is:

• In the first quest you would have to capture a T1 horse, for 1 Royal Fern Root. If you succesfully captured the horse and completed the quest, the NPC would give you an another quest, which would ask you to capture a T2 horse. If completed, you would get a third quest, asking for a T3, then a fourth quest, asking for a T4 horse - of course, depending on your Training level (so a person with higher Training level would be able to pick up more of these quests). If you are Guru trainer, you'd have a quest for T5 horse. These quest would give you the amount of Royal Fern Root equal to the tier of the horse you'd have to capture. 

In short:
1. quest: Capture a Tier 1 horse : 1x Royal Fern Root [Requirement: Skilled Training]
2. quest: Capture a Tier 2 horse: 2x Royal Fern Root [Requirement: Professional Training]
3. quest: Capture a Tier 3 horse: 3x Royal Fern Root [Requirement: Artisan Training]
4. quest: Capture a Tier 4 horse: 4x Royal Fern Root [Requirement: Master Training]

5. quest: Capture a Tier 5 horse: 5x Royal Fern Root [Requirement: Guru Training]

If the quest would be daily quest line, the amount of Royal Fern Root you can get as a(n)...
Skilled Trainer: 1 Royal Fern Root / day ( x7/week)
Professional Trainer: 3 Royal Fern Root / day ( x21/week)
Artisan Trainer: 6 Royal Fern Root / day ( x42/week)
Master Trainer: 10 Royal Fern Root / day ( x70/week)
Guru Trainer: 15 Royal Fern Root / day ( x105/week)

This is something which requires extra effort to put in, and capturing certain tier horses can be difficult and time consuming sometimes (especially in long run), but considering how hard our situation is it is something what I think, that many dreamers whom are wishing for a succesful T10 horse tap would do regardless. Let's not forget that this is such a limited game we get into, as Kurosity already made a good math about that:

" I have a few suggestions when it comes to T10. So far, at master training we get x4 each day 7x a week = 28 + 30 (weekly) = 58 total. 
In summary, it would take a year to get 30 attempts. (math: 52 weeks x 58 mats p/week = 3016 / 100 = 30.16) "

Is this really something which requires such a hard limitation despite that the whole game getting deja vued out of the old pace? Despite the amount of silver and base patience it actually requires? I'm sure that currently many of us would get into literally anything which would help us to make the period between two taps less long, even if we wouldn't get higher chance (so no failstack %) and we'd have to put extra time and/or money into that.

3.) Make the Royal Fern Root obtainable in different activities, like Gathering on certain places, Imperial Delivery (or even this action should get a daily or weekly quest for some extra Royal Fern Roots), Breeding Magical Crops etc.

4.) More Events which would grant us Royal Fern Roots, Dreamy Powder or the completed item for the taps ("The Incense Burner that calls the Dream").
• It could be even a Monthly Event or quest for "The Incense Burner that calls the Dream", for example.

In short, there are countless ways to approach the situation and this struggle, but I'd suggest to try to observe this situation in the same way as Pearl Abyss do their game and the pace it took now. It is faster, and offers a lot. Getting a T10 Horse? Now this is something which literally, one of the most limited things in the game despite the minimal effect it could offer for others - until they are dedicated people who really want a better riding experience, and personally I think that putting this huge amount of money and time into that just proves how much we are fighting for it - .

Dear PA, 

If the comments on this thread will really reach you, I just want you to know that I think your reasoning: "We can't make it too good so players don't feel forced to get it." is absolute garbage.

Because I don't see this "sentiment" when it comes to... let's say.. The Naphart Campsite :) You don't seem to mind that it's so good and convenient that any serious player on this game will feel compelled to pay you 50$ for it. You also don't seem to mind that melting costumes is the best way to obtain crons and any player who needs crons (like..90% of playerbase lol) is forced to play the costume preorder game for them. hm..

Mythical horses are not easy to achieve unless you get lucky. That's why you don't want players to feel forced to get it? Cause it's a lot of effort and investment? Sounds you should re-evaluate your Mythical awakening system design. 

With Dine and Doom, please consider us giving more than a high-stamina-cost and repainted Dream Horse with small conveniences. Reward the players who put in the effort, idk what kinda Developer makes content and doesnt wish for as many possible players to be interested in it and participate. Horse discord jokes that we are side-content but damn..don't do us this dirty.

?1

How about Mastery...

How come I have 2000 gathering mastery and struggle to make more than 250m/h?

Why did I spend hundreds of hours of my time and 140 billion silver... to make less than a season character can make in valencia?

+1 For additional t10 fern methods + fs. +1 for this comment in particular.
You don't have to make something too good for people to fully dedicate hours, months, YEARS of their life doing something.
For insight:
I joined bdo for horses. Then stayed for t9's. Once I had all of them, I branched out into pvp and took breaks. Then came t10's and I needed it. It was the only thing that I could strive for left. Could I go for more gear? sure, but why? I don't care unless it helps me get the t10. I could try and make the fastest t9?  After 20+ horses and only 1 I made having good speed, no.
The only thing that is keeping me hooked to this game is the magical horses.

When you have people like me, who stay for horses, we will strive for the best horses. And even if the horse isn't made to be good, we will still strive for it because it is the last goal we have.

Of course, you have people who are siege level who get it to flex how good their rng is and whatnot, but you can't create these limitations for the average player when the people who the content is aimed for suffer.

Stop making these limitations, PA. At least for t9 I could do 3 hours of dailies to take up time/grind for possible chance of pure forest breath. I'm literally at my breaking point with these t10 limitations because it's all I care about as a trainer.

No complaints here. I do have confirmation that thread has been forwarded through appropriate escalation protocols and our comments are seen.

I have no issue with bumps. This clearly impacts many of us.

Thank you for putting together this post! So many good suggestions, I'd like to add one more I couldn't find via search -

Allow usage of Crons for Horse Gear

Currently getting Granverre and Krogdalo beyond +7 is a nightmare, reaching a full +10 set is considered a near unreachable goal by many - downgrades are frustrating to the point, where I'd rather not go for it.

I have a +9 Krogdalo Horse Shoe and I dare not tap for +10 right now.

I think horse gear is similiar to sailing gear in that way.