I’ve used it a fair bit. The extra context helps with things like getting facts straight, but it doesn’t help with coming back to themes or the things that really make a story hit, you know? Even with the extra context, I still find the stories get worse and worse as they get longer.
I do think that a skilled author (better than me - I’m not awful but I’m no professional) could get a better output, but that doesn’t cut the author out of the loop there.