4K gaming

[Googolplex]

Right. As Traggey said, when your hardware is strong enough, you should use it.
I don't use a 4K DSR (Dynamic Super Resolution) to a modern game, when I got bad FPS.

But for all other games especially RPGs like Gothic 3, Risen, or Skyrim with a mass of vegetation, it makes sense. The DSR method is more effective than in-game AA. So you don't need extra AA when playing in 4K.