mcjob you're overthinking what im trying to explain.
Then explain it better. You're not making any sense.
What I read is that you were trying to imply as though cell shading is "cheap" to do, in terms of performance. I've never heard such a flagrant display of ineptitude in all my life. If you don't believe me, give Cinema4D a shot some time, or try opening up Unreal 4/Unity and applying a Toon/Cell Shader to multiple objects in the world.
Most 3D Modeling applications only render upon an update to the scene. Cell-Shading looks easy because you've only got one object in the scene and it can render the full effect in the same time that a game engine must do it over 100 frames. You're not understanding the depths of the tech because you're focused on high level modelling concepts, not on indepth technical detail of implementation.