Right. I mean half the pitch of the ol manifesto was "don't plan on finishing software because it's impossible to actually get requirements out of a customer ahead of time"
Well, if that's the world you actually live in, then you'd better be able to live in that world. (I mean, sure, ideally one should fix it. But your development approach has to work in the world you're trying to apply it in.)
And it was sold as a good thing.