Because I can construct the frame of the argument, my argument is always right.
It is photo-graphy, light writing. One form of photography is no more real or pure than another. The OP's arguments is just a qualification of personal bias without regard to history nor practice.
Silver is not light, nor are data. Stating the quantification light values based on a chemical process is somehow "real compared to an electronic method is just sophism. Both are simply processes. Both are abstract.