The quizzes are still somewhat difficult (and fairly frequent) so you have to still get your stuff done (and more consistently than the cramming encouraged by a big midterm/final)

I do spaced repetition in lectures, my homeworks are typically programming problems and, as I said in OP, rely on the student committing to doing them w/o AI. So spaced repetition of the most important topics on quizzes seems reasonable. (It's an experiment this semester)