A good tutor builds an understanding of the learners current mental model then tries to broaden it with targeted materials (text, diagrams, videos), selected exercises, the Socratic method ... All LLMs can do is produce text that statistically looks like tutoring. AI has a lot of uses but tutoring is not a great fit. I think a well written textbook even would be better than AI because the author can have a general understanding of where the target audience is usually at and where they're expected to end up.