AI didn’t invent the em dash nor “It’s not just X, it’s Y” and sometimes those are appropriate for the situation. Prose should be judged accordingly.

LLM didn't invent it themselves, they are plagiarism machines. Obviously these kind of patterns had to be popular in the first place to be overused by LLMs

Also we have reached the point where LLMs are pubkishing more contents than humans so we have probably reached a point where humans will inconciously start copying and using LLMs style too.