[Frondo]

Programmers are smart systems thinkers, or they can be.

And they (we) have a tendency to think, "here is a system that I have derived from first principles, and now I can apply it" ... which is, frustratingly, not how the world typically works.

No plan survives contact with the customer, but the kind of confidence that guy writes with can be dangerous because it can lead people down a long wrong path.