Very interesting read. I haven't tested the chatGPT yet. I'm no teacher but don't you think it would be noticeable somehow? I mean, the 'style' must be somehow different from what the student would usually write? Or do you mean some students would use the chatGPT all the time? And as a teacher, you would never get to know the student so to say?
But I'm just trying to think back on my own experience of Swedish (I know it's not the same but that's the subject I'm comparing it to as Swedish is my native language) throughout my school years. I understand a lot has changed since then. And I don't mean just AI-wise.
(If it were the subject English here in Sweden I think the teacher would be suspicious because the student would then write 'perfect' English, and that's not expected).
Oh yes, if students were stupid enough to hand in something way above their own language level, we would spot straight away. I believe higher level students will be better at using it.
There's so much capability here. More so that the image generators.