You've said nothing suggesting that the explanation doesn't work. Whether you believe in collapse now, collapse later, or collapse never but the Born rule work

You've said nothing suggesting that the explanation doesn't work. Whether you believe in collapse now, collapse later, or collapse never but the Born rule works, you get the same exact predictions. Therefore no experiment done to date represents evidence that there actually is a collapse. And evidence that the experimenter is modeled by QM is evidence against a collapse. This is all true, and is all verifiable from QM. And whether collapse handles later or never, the math behind the MWI explains why we'd think we'd observed what we observed in the absence of a collapse.