Virtually all methodologies like this boil down, in the end, to an attempt to codify "be smart and do the thing."

When I was younger I (foolishly) derided software engineering as 'a way to get code out of people who aren't smart enough to program'. Now I see it like any other power tool - something which lets you do work that you wouldn't otherwise be able to tackle. No matter how smart you are, there's always some problem that's out of your intuitive reach, but which you could solve with a structured approach.