You should talk to successful writers more. For decades, Harlan Ellison, for example, would sometimes sit in a bookstore window with a typewriter, take prompts for stories from people in the store, then stick each page up on the window when he finished one. So not just a first draft, but a first draft he really couldn't edit, because it was all done on a typewriter, not a computer. One of those prompts came from the creator of the X-Files, and the story was published in several magazines and anthologies. Several others won awards.
"He had simply written down music, already finished in his head." Also, real actual footage of me meeting someone who traditionally publishes their first drafts:
You already know why they call it rewriting. I have been through my historical fiction piece at least 30 times with a few beta readers and more waiting to help me make more changes. One thing that makes it hard for me to finish is that I'm refining my skills as I go, so the next time I read it, I'm amazed a mistake got by me again. Saying that reminds me of when I was in aerospace engineering, there was a time to kill the engineers and build the plane. Like all novels, we will have to come to a point where we step away as the editor and become the salesman. Although I do believe I should present my best, or close to it.
That's the thing. When you have published ten novels, the publishers are likely to be used to thinking that whatever you write sells. So you can afford not to dwell on details, because it's more efficient to throw the work to the market and start writing a new one. That's whom Heinlein's 3rd rule is for, not us the common mortals. We have to make our work as good as we can, or the publishers won't give it a chance.