The diet that we evolved to consume (fruits, lean meats and fibrous plants) was much less damaging to our teeth than the current high-sugar, high-fat, highly processed foods. And human lifespans was shorter, so less time for teeth to damage. So there wasn’t a strong evolutionary need to regenerate them (unlike an animal like sharks)
also, if a game relies in a complex physics engine, the physics simulations has to be done with a stable interval and FPS, which means it had to be decoupled from the rendering (which was not stable and depends on what you are drawing)