The reason people "dislike AI because of its tone" is that they only recognize AI-written text when it's poorly composed. It's likely that you're already interacting with AI-generated text without realising it.
Afaict, it's 'high quality' only in the sense of not containing many grammatical mistakes or spelling errors, which of course is not 'high quality' so much as 'basic literacy'.
I think I know what you mean about other elements of the tone (staid and obsequious) not necessarily being related to style but they don't quite form a clear identity for me. The defects of the writing are still more marked than its personality.
To be direct:
Your post assumes that all users are equally good at producing content with AI/LLMs — but if they’re not, then people who are better providing that to people who are worse will become a market.
Just like with chairs and writing, now.