Because if you're trying to write and you have unlimited time, you can procrastinate an unlimited account, but if you have limited time, you rush to the page trying to get something down in the little bit of fragment of time that you have, and you may write a great deal that way.
“Every time you go out on the ice, there are slight flaws. You can always think of something you should have done better. These are the things you must work on.”
“If you're a musician or actor, you know that if you're successful, some level of fame goes along with that. You're prepared. But how often does that happen to a programmer?”