They didn’t stop antialiasing. They stopped sub-pixel antialiasing and snapping stems to the pixel grid, which is less relevant on retina displays, to avoid artifacts when text is translated and animated.
I had the 24" 1920x1200 Apple Cinema Display for several years, and I vividly remember that text looked objectively worse after I upgraded from Mavericks to Yosemite.
I now use a 27" 1440p monitor and I'm always struck by how bad text looks on it compared to my 2009 MBP that's stuck on Mavericks until it dies (not due to text reasons, it's just slow as hell/no benefits to upgrading).
They did something that was relevant to 1x displays, because it used to be better.
It also requires you to know the pixel geometry, so may not work correctly on OLED or TVs or other display technology.