I agree with all that. If something really isn't working and you just keep flinging words and other content onto the page, that's a pretty good recipe for having a lot of throwaway work. I don't usually polish drafts as I'm writing them unless I do so for something to do while I'm mulling where to take the piece.

I'm not really a big outline person either for either writing or presentations. I almost always have some idea where I'm going though it's not unusual for that to diverge.