You misunderstand me: I agree that lazy SEO spammers are poor writers. My beef is with the GP's dismissal of writing slower than the speed of thought—when the best writers pore over these things more, not less. Quoting Thomas Mann, the 1929 Nobel Prize winner in Literature: "A writer is someone for whom writing is more difficult than it is for other people."
I did not read it this way. I read that post as arguing that fast writing is neither particularly important (which is what I read to be the main point) nor that hard (which, I think is what you focused on).
