Epistemic rationality is a subset of instrumental rationality, to the extent that you value the truth.
Compartmentalization protects us from seeing reality for what it really is: defined only up to the instrumental theories which trouble themselves with certain otherwise insignificant portions of it.
Epistemic rationality is a subset of instrumental rationality, to the extent that you value the truth.
-- Sark
(this allows the universe to keep existing after I die).