I did ask you to back up your claim that a photon is associated with an irreversible process.

@BillAlsept All I was saying is that there is no requirement for the fields to be made of anything, and that in any theory there will be fundamental elements that are not made of anything. Within the confines of QFT, the electron field is such a field. Whether this will be replaced by a later theory in which the electron is a composite field is unknown and not really something we can usefully speculate on here. I am not demanding that the electron field is fundamental just saying in QFT it is.