Fair points and we all think differently, which is great. For me, if I was chuffing up for a 4K monitor, I would want to show it off in its full glory and get the wow factor. And going from Ryan at PCper, he said you still need AA to remove the jaggies (which surprised me).
You don't need AA at 1440p, but me personally i choose to use it. Depending on the game and performance the least ill use is some form of FXAA/MLAA all the way up to full screen super sampling.