Well written. I've been thinking about this topic lately and it's hard to put it into words, but you've captured into words a lot of the feelings I've had about it.
Judging by discussions I've had around this topic, a lot of people don't seem to mind reading LLM edited or straight-up generated content as long as they feel like they gain value out of it. To me, it feels like a violation of a social contract. Communication isn't just words; the words are there to help you interpret the implicit meaning of the author. When there is no author, that meaning doesn't exist and I think that's part of why it's so repulsive to decipher LLM output.