If you want to add some quests to obtain a couple class defining skills, I have no problem with that. That's an acceptable storytelling mechanic. But making it so that no skills are auto-learned like the OP suggests, and there's a scroll to obtain or a quest to do or a mob to kill for every ability/spell like for XI mages, that's unacceptable. It's just an obstacle and a sign that there isn't enough real content.