Great points by David Barnard:

There is nothing inherently authentic about anything created digitally. There’s nothing genuine about 0’s and 1’s and any particular sequence that describes pixels on a screen. Humans created the hardware and software that sequence those bits, and unless we’re talking about some sort of futuristic research project, everything created digitally is created for some ultimate form of human consumption.

Software doesn’t have to use realistic textures to be “physically authentic”.