I once read that an atomic orbital can be conceptualised as a cloud of "electron-ness". That is, the electron literally is the cloud, and the probability density only relates to the probability of the electron interacting with another particle (say, a photon) at any given point in space.
This metaphor is fairly intuitive and got me through an undergrad course in physics and chemistry without issue. Yet I often read the caveat "the electron is not actually 'smeared out' across the probability distribution" with no evidence for why that is the case.
Is there an experiment/observation/result that disqualifies this interpretation in some circumstances?