I believe the reason why 1st drafts are referred to as 'crap' or 'vomit' drafts is to emphasize that they are not the finished book, but the beginning. Experienced writers who have gone through the editing process (developmental, prose, spag, etc) on previous works...may...produce a 1st draft that's closer to a final piece than a new writer. I call my 1st draft the 'story' draft. It was a great relief when I stopped trying to write a finished book, and just focused on getting the story from my head onto paper. Then I did a development draft (plot line, character archs, sub-archs, etc). Now I'm on the 3rd draft, which I call the 'prose' draft that I intend for people to read. Since writing for me is as much of an educational process as it is production, breaking it down into draft stages devoted to one of those processes has really helped. But everyone has their process, to state the obvious.