Trying to bring the real physical world into computers at current stage of our technology is impossible. Too much variables to consider, many of them unknown or not realized to be present at a scene, too much processing power needed… so PBR is a concrete definition, but not much concrete realization… instead with use tricky math to get a fast approximation of the physical reality… there is too much loss, so when compared to pure photography the difference is overwhelming…
“The application of both have different purposes: photograph is to capture an event in its pure form for the eternity, while the other approach is to take us to a fogged dream which resembles reality and fool ourselves that the dream was real or at least might become real someday…” and “eventually we will get there” 