If it's so easy to just copy and paste an essay from an AI generator that is of such high quality that it cannot be detected, then why are we still making students learn such an obviously obsolete skill? Why penalize students for using technology?
Surely, there are still things that are difficult to do even with the help of AI. Teach your students to use these tools, and then raise the bar. For example, ask your art students to make complex compositions or animations that can't be handled by Midjourney without significant effort.