Relying on AI writing will make people really stupid. It's like learning by watching videos, you lose the knowledge really fast again. Some things have to be done, some thoughts need to be experienced.
For business purposes, those tools are extremely helpful. Personal writing, it's a good way to lose the ways your characters influence the writing. Makes for really boring and dull content - not that excited about that. Life is about truth and the human experience for me, AI shall remain a tool.
I can imagine half the docs that are produced in my company being easily and more professionally done by using these tools. As you say though, when it comes to personal writing that is where they fall down. I have noticed that with video learning. Yo uhave to actually take notes and practice whatever it is or it just flies straight out of the head. Unless they are guitar videos, that sticks with ya!
Yeah, I can't memorize any details about the information I only watched in a video. It's a shame, but that's how it is.