Not sure I agree fully in the case of Uncertainty. To the best of our knowledge, an undetermined quantum property is actually undefined. Whether we go with the

Not sure I agree fully in the case of Uncertainty. To the best of our knowledge, an undetermined quantum property is actually undefined. Whether we go with the simple Many Worlds or the Copenhagen wave function collapse or even Pilot Wave theory, when the value becomes defined it is randomly selected (or our World is a random selection of all of them) according to the wave function. I believe what you're saying is that there is indeed a superdeterministic hidden variable that would allow us to know before the value is defined what it will be. For simplicity let's assume the Many Worlds interpretation... this variable would tell us which world we're in. The issue with this explanation is that we're not in that World yet, because our current World is only the result of past quantum events. When this next undefined value becomes defined, our single world splits into Many more Worlds, each of which has ours as a parent, so how could one of those be more or less intrinsically ours? Each is equally our World, and if we back up a single "step", our World contains all of the supposed hidden variables that say which child World is which. So I find that Many Worlds seems to invalidate superdeterministic hidden variables. With other, single-World interpretations, the hidden variables make more sense. What you say would be true. But single-World interpretations are already more complicated than Many Worlds, with or without hidden variables and superdeterminism.