that's what i do, but the posts still get engagement, and it's the same level of engagement as the non-AI posts by the same people, which tells me they are not put off by the AI-writing.

this. My not-at-all technical partner often comments to me that whatever youtuber is reading from an ai script and just turns off whatever we're watching. I assume similar happens in other areas.

For her its rarely the specific tells ("not-x-but-y" etc) but rather its bad metaphors and analogies that get her.

Most people don't care what the other person thinks about their email so long as their boss thinks they are doing their job (and their boss is usually the one paying/telling them to use AI) and the other side responds. Should they? Probably, but everyone should probably do a lot of things we don't.

I feel a tinge when I see an AI written email that is longer than it needs to be/boring to read but I still need to engage whatever it was they were emailing about anyways.