I suppose I get that idea of trying to free your creativity, but maybe I just disagree with it because that's not how I work at all. It usually takes me about an hour to write 500 words because I do sit there at my computer spending several minutes trying to figure out how to phrase the idea I'm trying to express, and though I suppose there is merit in freeing yourself of that self-editing, but when I write I usually feel like the perfect phrase I'm searching for is there, I just need to take the time to stitch it together and I'm not willing to just plow ahead and throw anything down to meet a time limit. You can always go back and edit but you might still miss that perfect phrase you're looking for because you're not really in the creative moment anymore.