Professors should create high-quality teaching material and teach their students well. I don't care what tools they use. They can copy from textbooks, reuse material from other professors or use a LLM - or even do it all by themselves.
My professor in theoretical physics did his classes by memory - deriving all the math live on chalk-board. Didn't give a single handout ever. Impressive and I learnt a lot that way. My materials science professor used a textbook, talked and explained that book with a few excourses left and right. Great course.
None of those guys was sloppy, though.