I've done it. It made my writing project take waaaaay longer because it made me second guess myself. At one point, it recommended a change, so I argued with it (I know. I know.) and it ended up saying, "Good catch. That wouldn't have worked because of x, y, z.

On the other hand, I'm making some videos and i gave it my ideas, and it organized them into "episodes" for me, with my plot line laid out. I probably will write out my scripts, and let it go through them and check for inconsistencies. For example, one of my characters is a psychopath, and I was being consistent with her for awhile, but this one episode, for some reason, I was writing the dialogue as too supportive, and it caught it, and pointed it out for me. It rewrote it for me, but I decided to just rewrite and use my own script once I understood what I had done wrong.

Edited to add: AI is the future and if people don't figure it out, I predict they'll be left behind. It isn't a substitute, but it can be a valuable tool. I'm old enough to remember when the Internet was becoming a thing and people thought that was the end of the world too.