My $.02 is that in the domain of software engineering LLMs have largely automated the process of copy-pasting from StackOverflow and existing parts of the codebase. Architecture and product management is still very necessary. In the same fashion they can also automate writing a novel. The issue is that prose is sometimes much more important in literature than it is software (because, after all, users use software, they don't read the code). I say "sometimes" because this clearly doesn't apply to stuff like schlocky bestsellers that one buys in airport stores and reads like movies.

When ChatGPT first came onto the scene I actually started using it to write something in this vein - a techno-thriller starring a former fashion model trained in Krav Maga working as a nuclear physicist who discovers a sinister government conspiracy to alter the foundations of quantum mechanics and enslave humanity with assistance from extraterrestrials. And, of course, only she can stop them with the help of a gruff-but-sensitive retired Marine who has since opened a ranch where he teaches orphaned puppies calculus. I only got 20 pages (so one gunfight and a car chase) in but it was as riveting as anything. Context limit cut my efforts short. Perhaps I'll revisit it soon.

I say all this to say that if words themselves are distantly secondary to narrative then I don't see anything particularly wrong with leveraging an LLM to help crank something out.