Ideas, sure. But grammar and formatting are typically completely different jobs like editing and typesetting. If you're going the indie route and self publishing, you might not be able to afford to hire someone else to do that work.

Those also happen to be things that LLMs are actually good at. They're (mostly) not creative tasks and instead just follow a set of rules.

I'm willing to give a bit of a pass on the grammar—someone may have learning disabilities or not be writing in their first language. And formatting a book is simple and mechanical enough that a piece of software might get it right. If you're relying on an LLM for actual plot, though, you're doing it wrong.

to be featured in the Smithsonian

Come on now, getting an ISBN is nowhere near the level of recognition of being featured in a major museum. Not really analogous. Having an ISBN is by no means exclusive or impressive -- it just means you've got a book prepared for publishing. A book, any book. Could even be a really bad, worthless book. Just the big news here is that it can't be an AI-generated book.