I think it matters because for a lot of us writing and thinking happen at the same time.

Something that's been written "well" shows that someone has thought about it, maybe reframed it some way or just done something by thinking about it for a while.

AI can think, but whether it's thought about something or not it's always going to sound the same.

If you are using it to help you think fine but I think it's about effort and I would want to know how much effort you've put in.