LLM writing is optimized, at a great expense, for that specific parameter. They literally have human raters fine-tuning "favorability" - general appeal - as a part of post-training. So yes, the conclusion here doesn't surprise me at all. By the way, this is also true of HN! You think you're better than that, but at this point, on any given day, we have around 10 LLM-generated stories on the front page (and another 10 are usually AI-related press releases or op-eds).

Anyway, human writing isn't like that. You have a style that some people will like, some people will find "meh", and some people will hate.

A better question is, do people want to read AI text all day? And the answer to that question is, I think, very different. Most people don't. Which is why so many parties are really determined not to tell you.