From my experience so far on the forum moderators only delete posts easily that are just too obvious off topics. Many times I've come across posts that are off topic or in the wrong board still sitting there still not nuked or moved. Moderators can't actually spot every single off topic post and that is one of the major reasons why we all have the report button.
Moderators can delete posts that have no value or off topic but mostly because of zero value. Some threads have no value and they will trash the whole threads, not only one or two posts in those zero-value threads.
Threads can be moved by moderators from original boards to Offtopic board if moderators consider those threads still have kind of value for discussions. If they consider threads are zero-value, those threads will be deleted.
Learning doesn't stop you from discussing things in the wrong board same way it isn't too big of an excuse to create off topic posts. I get your point but some posts obviously deserve to be nuked.
Accounts only can be nuked if they spread malicious links or files and I don't think if it is only plagiarism or AI-generated content, accounts will be nuked too quickly. Forum members complain a lot about too soft treatment on accounts with AI-generated posts and even take too long time for bans.