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.

All it can do is fill in the blanks with other people's work, and even that is something it does by rote. So you're not editing your own thoughts, which are formed by other fiction but also nonfiction and your own experiences and your thoughts on how to connect it all, just a lot of word vomit.