A pg quality essay is a whole other story but I doubt AI is much useful there in its current state.
Even formulaic messages and emails can be useful, because when what I want to write doesn't plug in neatly into the formula that sometimes means something.
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As a very concrete, though small, example: I have found that almost always when I use the word "empower" in any of its shapes I'm making a mistake (either taking a lazy shortcut in writing, or an actual cognitive mistake), yet I only notice it as I'm putting the symbols for it down.
Can attest. I had to write a bunch of definitions and do some preliminary research though nothing very technical. I asked chatGPT, it listed a bunch of stuff, I looked around the net, found some more hints, asked again; then I had the model to collect everything for me into a neat little markdown doc, and shared that.
Saved me a couple of hours of searching and writing useless / boring stuff.
The mere act of writing, regardless of the subject, seems to exercise the rational part of the brain and calm us down a bit. (The effectiveness of cognitive behavioral therapy seems to support this idea, though the existence of Twitter does not...) I think we have to at least entertain the possibility that a post-reading/writing world could be a much less rational place.
[1] https://www.gettingsmart.com/2016/03/26/exercising-student-b...