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Azathoth123 comments on What are your contrarian views? - Less Wrong Discussion
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Technical explanation: the problem with MWI is that it makes the fact that density matrices work seem like a complete epistemological coincidence.
Incidentally, I remember a debate between Eliezer and Scott Aaronson where the former confessed he stopped reading his QM textbook right before the chapter on density matrices.
I don't understand what you mean. Could you explain? I'm familiar with QM, so you don't need to avoid technicality in your explanation.
Suppose we have two jars of qubits:
Half the qubits in jar (1) are in state |0> and the other half are in state |1>.
Half the qubits in jar (2) are in state |+> and the other half are in state |->.
Notice that although from a classical Bayesian MWI perspective the two jars are in very different states, there is no way to tell them apart even in principal.
BTW, that's the only reason why I'm not fully convinced by realist interpretations of QM.