The physicality of a quantum wave. Is it math?

BURT wrote:


My opinion is that it is not "physical". Although I suppose there's no hard
definition of "physical" (is potential energy physical? are fields
physical? are particles physical? Answers to these have been different at
different times), I think a reasonable definition of "physical" should
exclude probability waves. A case in point would be the EPR paradox
(followed by Bell's theorem and experimental verification of validity of
Copenhagen interpretation), where "collapsing" of a wavefunction happens at
superluminal speeds.

IMO, This is sufficiently different from all physical things that we know
that we ought to consider matter waves as something not quite physical.