>>342418981
Well one problem is of environment lighting interacting with shaders. The lighting resources available in different maps can vary wildly, so some just go lazy use the most basic shaders that don't account for every condition. Some do, so you can actually get the lighting on your model to match well with scenery of the map. Sometimes it's impossible though because the map is just shit. Booth models generally do use the good shaders that handle things well most of the time.