I dont see why UBI should change anything, it is infinitely more simple programming a game using a flat world.
Most players never even realized the SH 3/4 game was flat and it has no practical impact on the game, other than a arbitrary visibility limit.
In SH 4, where the distortions are huge compared to SH 3, I had done some checking on fuel usage and travelling time between various points on the SH 4 map and what it should be in the real world, but the difference is not really noticeable....especially after the novelty wears off and you start warping from point to point...
