For my personal purposes I resolved the issue by looking at elementary particles as if they are only the "probability" waves. Never anything else. Measurement is just an interaction and it reshapes the waves making them narrower. But they never become pointlike particles with specified location or momentum. They are always more or less fuzzy.
If they are all bound into macroscopic object they are sharper and as a result they can make other elementary particles they "measure" (interact with) also sharper.
If particles interact with fuzzier part of macroscopic object, like an edge of a slit, they can become fuzzier, more wavy.
So the proton really is that shapeshifting soup. Never anything else. If you hit it with something hard enough it becomes momentarily disturbed into a bit sharper state that can tell us something but it immediately goes back to soup because of chaotic microscopic interactions inside.
The matter looks sharp only on macroscopic level. At the level of particles it's always fuzzy, but we have trouble of ditching the concept of little balls bouncing of each other because the math describing exchange of energy and momentum between those fuzzy "waves" looks like there were some small balls bouncing. But this comes, I believe accidentally only from the fact that all forces have sort of spherical symmetry.