One thing I did want in Fallout 4 that I don't believe it presently does is dynamic generation of polygons in curves.

The game has environments with kinda curvy surfaces, but aside from the dynamic level of detail models, the engine can't go throw spare horsepower at generating more polygons to make smoother curves. I think that that's a good match with long-lived PC games, because people playing it years later on more-powerful hardware can burn their extra cycles on making things pretty.

It's not vital or anything, just think that if there's one game where it'd be neat, it'd be Bethesda-type games.