In standard quantum mechanics, collapse absolutely is an axiom. I really have a lot of sympathy for the Everettian no-collapse position, with effective collapse caused by interactions with the environment. Nevertheless, the measurement problem hasn't actually been solved. The Born probabilities haven't truly been derived, except under some truly restrictive assumptions.
> Nevertheless, the measurement problem hasn't actually been solved. The Born probabilities haven't truly been derived, except under some truly restrictive assumptions.
True enough, but what else could you expect the experience of being in the Everettian universe to look like? I think it's fair to say that experimental results are at least compatible with reality following the Schroedinger equation without needing a collapse postulate.
