Writing Under Pressure

I was just reading how a blogger needs to learn to write more quickly. For those engaged in NaNo that is apt advice for writers.
What difference does writing faster make? As long as the writing gets done, it shouldn't matter if it takes a day or a week. Perhaps it doesn't. It does for me.
Yes, I can be a self starter. I am very good at starting. Looking over my computer this stands out. I have lots of books started. Then they sit there. I play with them occasionally but they never get done.
When I want a book to get done, I set a deadline to get it done. I set a challenging deadline. Why?
When the deadline is loose, the book slides from day to day. I add a hundred words here, five hundred there. In between I forget the plot line, the story arc, the character traits, the things that turn a story into a novel.
A tight deadline makes sure I put the butt in the chair everyday. It makes sure I am thinking about that book everyday, planning the next scene, the next problem for the main character to overcome. Then the story becomes something alive, demanding, morphing, pulling me as the writer in so the words flow. Yes, the flow can snag or pool from time to time, maybe even eddy. But the current is too strong and the draft gets written.
Once that draft is sitting there, it is easy to keep working on it. Complete the research. Do the rewrite. Do the edit. Make it into a novel ready to share with others.
All it takes is that deadline forcing me to write faster, to get it done, to quit agonizing over every word. That can wait until the rewrite when the choices become clearer because the story is known.