Question

I know this is a bit of a physics question and not really the topic of the site, but since you understand the subject, I’m asking you.

1. Why assume that before measurement the electron is in a superposition of eigenstates, and after the measurement it collapses to a particular eigenstate with a certain probability, instead of simply assuming that it was always in a particular eigenstate and we just didn’t know it until the measurement?
2. According to the uncertainty principle, it is impossible to measure position and momentum simultaneously (this is true of any two non-commuting operators, but let’s take them as an example). But why assume that there is uncertainty in nature itself? In other words, one could assume that the uncertainty is only in our knowledge of the position or momentum, simply because we cannot measure it. But in reality there is a definite position and a definite momentum. That is, the uncertainty principle exists only for us, not actually in nature. Why not understand it that way?