the output is literally physically photo-realistic, with fully-accurate GI lighting and accurate BSDF material interaction This isn't true at all. At what poi

the output is literally physically photo-realistic, with fully-accurate GI lighting and accurate BSDF material interaction This isn't true at all. At what point are the equations "accurate"? What margin of error is acceptable? We still have a long way to go before we can claim accurate lighting equations.