What if neither position nor momentum are fundamental, though (which, as I understand it, is the “default” for the math behind QM)? According to my understandin

What if neither position nor momentum are fundamental, though (which, as I understand it, is the “default” for the math behind QM)? According to my understanding of the uncertainty principle, neither of them have values until their values are collapsed (whether it be through many worlds, pilot wave theory, or what have you).