Although instrumental rationality is an interesting category, I tend to view it as ultimately boiling down to epistemic rationality. For example, I reason that A leads to B. I wanted B but I didn't want A, and now my motivations start traveling up and down the A -> B causal chain until I reach equilibrium. Or for another example, I notice that if I choose C for reason R, my rational game-partner will likewise choose C for reason R, because of some symmetry in our properties as agents. Now I need to compare the outcome of choices {C, C} to other possibilities, but I can rule out {C, D}, say.

My attraction to various options will change in response to learning these facts. But the role of rationality seems to end with arriving at and facing the facts.

No? Or, beside the point? (But if beside the point, still an interesting new point, I reckon.)