There are the special cases of sims, like flights ims and racing sims, where you will notice that difference very much - you will only be needing it for a tiny fraction of the screen, but there it then is vital.
Think of the enemy fighter plane somewhere out there far away, just barely visible. Or the next bend on the race track after a long straight. This is where even with the new Samsung displays you still are left guessing if there is anything to be seen, and what exactly.
Display resolution still has a long way to go for a number of use cases, and it is about more than just proper aliasing - sure, that can help give the impression of more sharpness but will not show more details where the information has not been included in the picture data feed from the GPU.
These sims make up quite a good part of the VR community...