Could anyone have made a different choice in the past than the ones they made? The answer depends on whether or not the Universe is comprehensively and rigidly deterministic . Current scientific understanding says it is not. — Janus
I think an interesting question is, where does quantum randomness come from? There are a few interesting options, but one option in particular I personally really struggle with.
With many worlds, the randomness is actually only apparent randomness, an inevitable subjective experience but not random at all from a meta perspective.
Pilot Wave theory says there's no randomness, the conditions are there which determine any quantum result (maybe retrocausally).
Random-collapse says neither of the above are the right way to conceptualise the randomness, but in this way there are still two possibilities:
1. Non-local causal reason for why this random result was observed instead of that other random possibility. Imagine a universal random number generator that can affect quantum particles non locally.
2. Genuinely no reason at all. Literally no reason whatsoever why one random thing was observed instead of another. True ontological randomness.
I can't really wrap my head around 2. A lot of people go for #2 but, to me, literally any other possibility seems more comprehensible.
Obviously the universe just does what it does, with no concern for what I find comprehensible, so I could easily be wrong. If #2 is reality then I just don't comprehend reality. But damn, I really don't think it's #2. I'm with Einstein: things don't happen for no reason.