I just rewrote chapter one of my horror novel from scratch and then fed it into ChatGPT, asking it to beta-read it as if it were a literary agent evaluating the work as a potential horror submission, evaluate the POV and pacing, evaluate the horror hook, and evaluate the effectiveness of the horror scene in the chapter. To be honest, I was pretty impressed by what it came back with. Such and such parts were unnecessary, agents are looking for xyz in the first chapter, cut out this and that, beef up the opening, etc. To make it more effective, it suggested easing into the tension, adding descriptive elements, etc.
Did it write the chapter for me? Did it sound AI-generated afterward? No and no - I used my words. All it did was coach me, which, for a free service, I found very helpful.
At one point, however, it asked if I'd like to have it take a crack at rewriting the opening sentence for me, so I said sure. Of course it generated some AI-sounding drivel that wasn't consistent plot-wise with the plan headed forward, and was straight up omniscient rather than third limited, like i'd been writing.
So, coaching - yes, feedback - yes, idea - generator - yes, secret little elf that will write your story for you - NO!!