The argument can be made that perhaps in our style of game we confine the game world too much in order to maintain its internal logic, that we force a path on the player that maintains its illusion only so long as the player is not trying too hard to break out of its confines -- but in this there is no half-way, you either do it or you don't.

I suppose we could add a similar type of physics engine to the type of game we do, but think about some of the other differences there... if it's not a single-character game and you have a party to concern yourself with, where are they? Are they magically in your pocket, only appearing during combat? Do they have to move beside you? If so, suddenly having riding and climbing and flying becomes an issue of the entire party needing to ride and climb and fly. If you try to allow for that complete freedom which takes advantage of such a physics engine, suddenly you start facing more and more variables -- and once again you either have to make a decision on how hard you are going to maintain the internal consistency of the world.​