The illusion of smooth collision detection is paramount to a realistic gaming experience. Imagine if you were playing a horror game and you suddenly slipped through the dungeon walls, or you were driving a vehicle through a forest, only to crash into a tree with no effect or feedback. The facade of realism would instantly be broken. The horror game's environment would no longer be immersive, and driving your vehicle would simply feel like moving a camera through a world you cannot touch or feel.
