I've used skill trainers to advance skills, but i think there should be less of them with lower level caps. The good thing about morrowind leveling is that grinding involves using the skills and skill trainers can advance a skill proficient enough to become useful in combat or crafting.
>>29487>letting player be master of everything like TES undermines player choice.Most angband-likes i've played make each class very distinct, not only because leveling is usually slow. Spellcasters cannot wear gloves and get penalties from AC and hybrid classes like paladin get less experience and don't receive some abilities of the pure classes.
These restrictions do however make classes feel linear. You could adapt this to a TES-style class builder by spending character points on abilities that lift restrictions, for example casting in heavy armor, learning spells in schools other than mysticism or sneaking in heavy armor. You could also provide "class discounts" i.e. not being able to learn destruction spells gets you bonus points in restoration.