You're assuming a lot of things in the pursuit of a perfectly spherical game, here. If it were that simple, one might think developers would already do similar.

You're assuming a lot of things in the pursuit of a perfectly spherical game, here. If it were that simple, one might think developers would already do similar. And some do. But a lot of games have issues with this approach, particularly when negotiating data that is partially owned by the engine and that which is owned by game logic.