Or morality! (Any action -> but is that the right thing to do? -> combinatorial explosion of extremely confusing open questions about cognitive science and decision theory and metaphysics and cosmology and ontology of agency and arghhhhhh.) It's like the universe itself is a Confundus Charm and nobody notices.

How much of decision theory requires good philosophical intuition? If you could convince everyone at MathOverflow to familiarize themselves with it and work on it for a few months, would you expect them to make huge amounts of progress? If so, I admit I am surprised there aren't more mathy folk sniping at decision theory just for meta's sake.