@Grey Wolf
Switching sorts of 'writing,' a computer science professor I knew swore by the advice 'Write it, write it again, then write it correctly.' That works for research, but it'll kill most commercial projects. I suspect there are resonances with writing in the book sense.
Having a good editor, as Heinlein assumes, means someone is rewriting for you and then you're rewriting their rewrites. A polish on a polish.
But let's look at your phrase that it'll kill most commercial products, and the answer to that is "No it won't."
JK Rowling rewrote the first chapter of her book 15 times. She rewrote other chapters of her 7 novel series "more times than she can remember."
Advice from professional authors who live by the deadline is basically, "How to do it fast and live with it."
That's not a bad thing. But for a new writer, the only way to learn how to write is to re-rewrite what they've written, and not a word here or there, but a deep look at the words they put to paper so they can say, "Oh, that sounds like shit. I don't like that. What was I thinking? My dialogue is so on point and in your face, it sounds like I'm winking to the audience with a cross body fist pump."
Once you've done that enough that you can see the weaknesses in your writing, then your first draft becomes better and takes less re-writes and editing.
People who rewrite a lot are Vladimir Nobokov, Ernest Hemingway, Roald Dahl, Stephen King, but then those who don't are, Charles Bukowski, Ray Bradbury, and Isaac Asimov.
(Lee Child is on the research list who doesn't, with the statement that he never looks back but I also read an interview with him where he stated that going back to fix his errors is a pain. What he does is "churn" which is to write all day, and then the next day, re-read and edit his work aloud.)
From what I've seen, people like to write less than they like to have a finished product.
Now, readers will read anything that's entertaining enough, and much like TV shows, writing can be sloppy, hokey, or even silly, and still be fun to read.
For new writers, rewriting is the shortcut to getting better.
For professional writers, rewriting about perfectionism.