The pre-rendered cinematics are a relic of a prior era. We have no further use of such contrivances; the modern computer is capable of rendering far more detail than the eye can see.
Grape soda doesn't even taste like grapes but it sure as hell taste like purple.
Madness string 2977
Why does the mind do such things? Turn on us, rend us, dig the claws in. If you get hungry enough, they say, you start eating your own heart. Maybe it's much the same.