It's amazing how many of these "rationalists" are using the concept as an emotional band aid against their resentment and other uncomfortable feelings.
And its not about compartmentalization. Ideas vary in their usefulness or actionableness. Sure, it takes instinct to distinguish them. But that is what "rationalists" are scared to death of, there being things like instinct and unconscious processing that, honed right, is often much superior to their laborious, droning but logical attempts to count every outcome, but requires faith in oneself.
It's really just a huge inferiority complex that they have. They are so insecure that they need universe-circumscribing systems of Bayesian logic to do anything. The truly rstional thingg to do is to put down the fucking rationality handbook, stop running the fucking expected value computations, go outside, live life, dare for the world to correct you, and get stronger or die trying. Thats it.