Well, it didn't work. Your argument has turned into an ouroboros. You started off by arguing for free TF-given abilities and has mutated into players spending money and time to "purchase" them, then come full circle by stating that certain powers be made available and freely available to everyone.
(This will upset the game's balance and be a bad design) Only if those abilities don't have direct analogues that aren't tied to the transformation. You can level the playing field even further by requiring the transformed Champ to spend time and money/other resources on learning to properly utilize their new abilities.
In my mind, an alternative system of acquiring those abilities - TF, then trainer's quest, then free lessons - would be fair and balanced. However I recognize that the devs might disagree and that's why I mentioned that even after fully converting this alternative system into a copy of the class trainer system with extra steps, ensuring that it won't skew the players' incentives, it will still have value. Namely providing meaningful sidegrades to currently available Powers, more flavourful options for the roleplayers (or people loving the particular race very much) and the trainer quests themselves.
What you fail to realize is 1) what I've already argued, 2) what has repeatedly been stated by the devs in NUMEROUS threads over the past few YEARS, and 3) the lack of people to write this shit.
It's a dead topic. Quit kicking it, you bully.
1) See above.
2) I haven't seen or been pointed in the direction of those threads, so eh?
3) I have bits and pieces of Zhara and Shar scenes for flight lessons right here on my laptop and ideas for who can be hornet and Effigy trainers. That's how this idea got stuck in my head, I will gladly commission other missing bits and pieces needed if the whole shabang is ever greenlit - which I'm aware is very unlikely. I also don't think I'm the only rando interested in this thing, even if all the usual writers aren't.
Not kicking nobody here, chief. If anything, I'm gently massaging the topic's (and devs') balls and gauging the reaction.