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Jayson_Virissimo comments on What Are Probabilities, Anyway? - Less Wrong
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In this view, rationality doesn't play a role in choosing the initial weights on the possible universes. That job would be handed over to moral philosophy, just like choosing the right utility function already is.
No, thinking it doesn't make it so. Even in this view, the right beliefs and decisions aren't arbitrary, because they depend in a lawful way on your preferences. You still want to be rational in order to make the best decisions to satisfy your preferences.
Isn't that conflating instrumental rationality and epistemic rationality?
Epistemic rationality can be seen as a kind of instrumental rationality. See Scoring rule, Epistemic vs. Instrumental Rationality: Approximations.