[jfengel]

No worries: superdeterminism is perfectly valid QM. You can have that cake and eat it too.

What you lose out is the ability to know what that determinism is. You do the experiment and the universe really does know if the electron is destined to go left or right, and has ever since the Big Bang.

But you cannot possibly. Superdeterminism forbids you from knowing beyond a certain amount. There will always be a minimum uncertainty to you. (That's distinct from Heisenberg uncertainty, but it's related.) The only way to know which direction the electron goes is to do it. And having done it, you can't meaningfully talk about the alternative, which would be like trying to talk about what would happen if 3 were equal to 5.

So, if that's a thing you can live with, then you can have superdeterminism and be happy about it. QM will back you, and so will every QM experiment.