EY suggested (if I remember correctly) that MWI interpretation of quantum mechanics is true as it is simplest explanation. There are around hundred other more complex interpretations of QM. Thus, in his interpretation, P(MWI) is more than a sum of probabilities of all other interpretations.
EY suggested (if I remember correctly) that MWI interpretation of quantum mechanics is true as it is simplest explanation. There are around hundred other more complex interpretations of QM. Thus, in his interpretation, P(MWI) is more than a sum of probabilities of all other interpretations.
MWI is more than one theory, because everything is more than one thing.
There is an approach based on coherent superpositions, and a version based on decoherence. These are incompatible opposites.
How simple a version of MWI is, depends on how it deals with all the issues, including the basis problem.