The task being spelled-out here is also pretty much one program being done by one person who is more-or-less fitting it together by feel.

We either do things the Sundial Way (the big thud of specifications gathered meticulously up front, and by gum, if the users aren't happy at the end of the process, that'll teach those pinheads to take requirements gathering seriously next time, I mean it), or we're heroic cowboys pulling all-nighters because we couldn't possibly get anything right if we didn't strap our poor hapless users in dental chairs and pull future predictions out of their mouths.

Strawman much?

I realize anecdote is not the singular of data, but I'm not the only person around here who's used agile development to deliver software that delighted our (yes, it scaled to a whole team) customers. Now either we're all liars, or you're wrong that it doesn't work.