You can remove a lot of toil from the writing process without taking away a writer's ability to do line edits. There's a lot of outlining, organization, bookkeeping and continuity work AI automates in the early draft/structural editing process.
Most writers can't even get a first draft of anything done, and labor under the mistaken assumption that a first draft is just a few minor edits away from being the final book. The reality is that a first draft might be 10% of the total time of the book, and you will do many rounds of rereading and major structural revision, then several rounds of line editing. AI is bad at line editing (though it's ok at finding things to nitpick), so even if your first draft and rough structural changes are 100% AI, you have basically a 0% chance of getting published unless you completely re-write it as part of the editing process.
Most writers can't even get a first draft of anything done, and labor under the mistaken assumption that a first draft is just a few minor edits away from being the final book. The reality is that a first draft might be 10% of the total time of the book, and you will do many rounds of rereading and major structural revision, then several rounds of line editing. AI is bad at line editing (though it's ok at finding things to nitpick), so even if your first draft and rough structural changes are 100% AI, you have basically a 0% chance of getting published unless you completely re-write it as part of the editing process.