Not him, but in your image, the textures don't have shadows painted on, as evident in the floor, barrel's side and box texture>>505121
Not him, but how the hell is Dota 2 materials in anyway PBR, technically or visually?
Source 2 does not have PBR, and even if they did, no game using it has implemented it so far.>>505135
In my opinion stylized shading can be ruined by "real" shading, it's like asking
"But we can accurately simulate smoke clouds as per real world rules in this VFX shot when the helicopter flies through it, why wouldn't we want to use it?"
Because sometimes reality doesn't look good, and exaggeration and stylization makes certain renders better
Have you seen what it would really look like as per real rules? No contrast, clouds moving in a very non-dramatic fashion, very anti-climactic, not exactly something you'd want in a shot if, say, it was some sort of rescue helicopter at the climax of a movie.
Depends on it's purpose I suppose