Luke_A_Somers comments on What false beliefs have you held and why were you wrong? - Less Wrong Discussion
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It has been shown experimentally long ago that MWI requires full Quantum Gravity, not just Quantum Mechanics (plus Newtonian gravity or General Relativity, or even semi-classical gravity).
EDIT: provided an alternate link (paywalled, sorry).
Who out there, MWI-adherent or not, seriously thinks that QM is a fundamental rule of nature for everything BUT gravity?
My position here is Knightian uncertainty -- I have no idea whether that's true AND I have no idea what are the chances of it being true.
That's, umm, nice, but I don't see how it helps answer the question since I suspect the number of 'not me!' would be enormous.
Not sure what you are asking, but Everett and many other MWIers certainly thought/think that "the wave function of the universe" is all one needs to know.