OK, I'll give you that we might non-instrumentally value the accuracy of our beliefs (even so, I don't know how unpack 'accuracy' in a way that can handle both probabilities and uncertainty, but I agree this is another discussion). I still suspect that the concept of uncertainty doesn't help with instrumental rationality, bracketing the supposed immorality of assigning probabilities from sparse information. (Recall that you claimed Knightian uncertainty was 'useful'.)
If it's worth saying, but not worth its own post (even in Discussion), then it goes here.