How can particle super position exist? How do we know that we won’t later find ways to prove its location without observation?

This is confusing to me, how are we confident that it’s “random” and not that we just don’t know yet like we say with dark energy? With that it’s at least “we don’t know yet”. Also, Schrödinger’s cat as a hypothetical doesn’t make sense here to me. I see how it could be used as a way to explain parallel universes but in the universe we’re in, I think the cat would be for sure alive/dead even before the box is opened, how is it both? What am I missing here? I want to learn.