It depends how big your monitor is, the resolution, how close you're sitting, etc. Also depends how much jaggies and shimmering sticks out to you. It sticks out to me like a sore thumb, so I always use AA at any resolution, even higher than 1440P. 1440P is usually for bigger screens, so typically the pixel density isn't high enough to eliminate or hide jaggies in any way compared to 1080P. A 23" 1440P monitor would appear less jaggy than a 23" 1080P monitor, but a 27" 1440P monitor would probably be on the same level as a 23" 1080P in terms of jagginess. On my buddies 1440P 27" monitor, which we seat a couple of feet from, jaggies are just as visible as 1080P, so he uses AA. Or even on my 24" 1200P monitor, I use DSR in the majority of my games to play at 1697P (weird rez), and I still like to have at least 2x AA and some post processing AA because the games are still a bit jaggy, despite the rez being much higher than 1440P.
Just about in any sort of situation, you're likely going to want at least some post-processing AA if you don't like jaggies and shimmering. If you don't mind jaggies or shimmering that much, you don't really need AA at all.
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