Indeed, we were talking about rationalists (not only LW, but SlateStarCodex too for instance).
I think there are meaningful instinctive differences too, but that’s not the point, is it ? If it was, then we can assume that people holds beliefs too. Sometime they change their beliefs too because of reasons (or lack thereof).
I agree with your model, but without the nerd-exception.
The lack of nerd focus on epistemology and meta-ethics implies that nerds don’t have beliefs either.
They do have pressures to appear rational. Either external (peer pressure) or internal (intelligence/rationality being part of the core identity because of reasons).
The same model you mention has been useful for me in understanding why nerdy people don’t actually care about the epistemic soundness of their argument, and only about sounding rational. It made me understand why many were angered when I pointed the lack of sound definition of the words used or the use of countless fallacies : it’s perceived as an attack against their rationality.