An important point about detecting the photon is that the detector absorbs all the energy of the photon: it’s not as if it is classically sampling part of a distributed EM field. That’s still true if the photon is never a point particle.
An important point about detecting the photon is that the detector absorbs all the energy of the photon: it’s not as if it is classically sampling part of a distributed EM field. That’s still true if the photon is never a point particle.