Full Idea
Schrödinger's wave is a bad image for an electron, because when a particle collides with something else, it is always at a point: it is never spread out in space like a wave.
Gist of Idea
Electrons are not waves, because their collisions are at a point, and not spread out
Source
Carlo Rovelli (Reality is Not What it Seems [2014], 04 note)
Book Reference
Rovelli,Carlo: 'Reality is Not What it Seems', ed/tr. Carnell/Segre [Penguin 2016], p.105
A Reaction
And yet there is the diffusion in the two-slit experiment, which Thomas Young discovered for light. I must take Rovelli's word for this.
Related Idea
Idea 21208 Eletrons don't literally 'spin', because they are point-like [Martin,BR]