>That's what electrons, and photons, and neutrons, etc, are. [...] They are bundles of probability amplitudes smeared out over space and time intervals. This is not a metaphor. This is stark reality.

Aren't you describing a representation of atomic particles, not the particles themselves?

Edit: I'm not looking to get into a discussion about what constitutes "existence". I am just wondering if you are conflating a scientific-mathematical model for a thing with the thing itself.