*> It seems likely to me that the superposition in the formalism actually ju...

> It seems likely to me that the superposition in the formalism actually just represents our ignorance of the system's state, not the state itself.

Again, nobody argues that. It's possible to experimentally distinguish between the two situations (Bell's theorem). This is a bit of a strawman.

Besides the wave function is a complex vector. It can't represent ignorance. You have to take |ψ|2 to get a real value.