Sadly, when one gets away from open source development and sees "enterprise" and/or "government" (a subset of "enterprise") development, what one finds is that everything is almost exclusively "deadline date" driven. The PM's and/or upper level managers pick dates for deliveries (seemingly often without regard to ability to achieve deliverable X by date Y) at the start of any dev. cycle. The end result is the low level managers get pressured to "meet the date" and so the developers get pressured to go faster to "meet the date" with the result that often the deliverable X "meets the date" but is very buggy, hacky, ugly, hard to further extend, etc.

And then, of course, for the PM's and upper management layers, the fact that their project "met the date" is what is measured and congratulated all around. The product could be a stinking pile of XXXX, but "it met the date", so they get their kudo's, their bonuses, and the devs. and users are left with "stinking pile of XXXX".