[n4r9]

That's one position in a century-long debate. But there are other assumptions than locality in the proof of Bell's Theorem, which other interpretations of QM relax. Like having single measurement outcomes (many-worlds), or observer-independent states (QBism).

[jostylr]

In terms of quirkiness, how would you rank them? I feel like nonlocality is far less quirkier than saying that all possible outcomes of a measurement happen even though we just see one. Also standard QM has the quirk of being nonlocal. So QM is just quirky.

[n4r9]

There are many that I don't understand very well, so I'm reluctant to rank them. My tendency is to be skeptical about how clearly us humans can see the underlying reality of things, so I find epistemic interpretations like QBism appealing on that basis.

The "every outcome happens" aspect of many worlds is a lot to accept. Otoh that's what you get if you take quantum states to be ontological and universal. My problem is more to do with how the Born rule falls out. There are some arguments for it based on decision theory, but I find the step from "this is how a rational betting agent maximises winnings" to "this is the objective probability of a scientific observation" uncompelling.

I'm not sure what you mean by "standard QM". There's the mathematical framework - which is effectively a way of calculating probabilities of measurement outcomes - and then there are interpretations, which assign ontological status to some/all of the mathematical objects. Non-locality properly applies to the latter, since you cannot say that the "real" physical state of a particle has changed until you've said which parts of the mathematics are real.