Once I've refined it enough, I post it to avoid getting stuck on an eternal loop of rearranging commas. As I said, that's my own personal process, but I'm pretty sure a whole lot of writers find the translation stage maddening, too. So it's really tempting to want to outsource that stage.

Come up with a neat concept -> feed a synopsis or whatever to an AI -> get a draft you can refine into something good. Except it doesn't work that way. If you ask gen AI what's 2+2, it doesn't do math. It finds that statistically speaking most people adding 2+2 get 4 as a result.