"Rationality is systematized winning" is a slogan that was adopted to patch a bug in human cognition. Namely our endless capacity to delude ourselves about how we did in an attempt to save face. The concept seems to have been absorbed, but I'm skeptical it's translated into more effective action. Certainly it produced many essays on why winning isn't happening. But the fact that we've been publishing essentially the same essay for a decade now implies something fairly fundamental is wrong. This slogan was chosen because it patches the bug, but I fear at the cost of neutering our ability to focus.
True, I also agree with the edit in that it's also useful for other reasons, but the expected inferential distance on that was larger, so I figured I would better make the easy-to-make point than none at all.