I'm one of the ones who found out the hard way that what I was writing wasn't what I wanted at all and hard to start over. Learning curve, I guess. I don't plan well either, I think once the initial plan is worked out, I know the story, so what's the point of writing it? So I am writing, and won't be posting/publishing til finished. No matter how much I think I know what I'm doing this time, I bet I don't, really.
I wish I was one of those people who can bash out 2k chapters every single day though. Sadly I have a life and that proper gets in the way of anything I want to do like