I agree with Doctorow about the de-humanizing nature of this sort of work - but to your specific point about fact checking, it'd honestly be fastest to outsource that to a different LLM, maybe ChatGPT in "deep research" mode or something like that.
That's not what humans do when they are fact finding, though. It's not what a (proper) scientist would do if she/he discovered a great insight or theory and was wondering whether it was true.
They'll suck, of course, but so do most of the books on any given "Summer Reading Guide."