I think it depends. If the paper in question is about some dry STEM subject where there's only going to be one right answer, and the real point of writing it is to ensure the student understands the subject, I can see where AI plagiarism will be a big problem. But for other assignments that won't have some single correct answer, like a high schooler writing an essay about a book, AI does not do a very good job. It will never do a good job because AI has to consult existing writing to produce anything. Having an AI write that sort of essay is like asking your friend what they think if your new car, and all they can do is list rote details about the car like "it's blue" and rattle off manufacturer trivia. In both cases it's just a student robbing themselves of knowledge, which is going to bite them in the ass eventually. Ideally without killing somebody.