Acquiring new skills anywhere VS Class trainer

I like having new abilities right away when I level up. Particularly if I'm far afield of any towns.

I do understand that "free respec at any time" can be a bit much, however, and from what I understand is contrary to Steven's intent. Perhaps allow us to spend skill points anywhere (out of combat, of course), but only allow us to un-spend them in town.

Learn all skills through books/scrolls. Some of those are sold by specialized npcs in specialized nodes of particular lvls (or just maxed ones).

Upgrade skills on the fly, so when you get skill points, you can go deep into a skill instead of learning another one. And going deep shows your proficiency so it doesn't need a master to teach you.

All augment schools should be learned through quests.

And as a total weeb point that might not work out in a real game situation - hidden skills that can only be acquired through some in-game achievements/actions or through some random npc that changes his location every day. In other words, hidden abilities from SAO