> it's the fact that LLMs use them so frequently
That's the problem with all the LLM writing tropes, really. When used correctly, they are all helpful writing tools to get your point to the reader. The em-dash, "it's not X, it's Y", "Not X, Not Y, Just Z", "It's worth noting" (I use that one a lot in my own writing), etc.
It's not that the patterns are bad (they aren't), they are just over used.
> "it's not X, it's Y", "Not X, Not Y, Just Z"
Interesting how LLMs have their own preferences too. Those in particular are very often used by ChatGPT, while Claude until recently couldn't stop saying "You're absolutely right!"
I also have a problem now with "it's worth noting", I use it a lot, I still like it, but now it's a dangerous phrase because of LLM associations.