>I have pretty good vision and I don't notice individual pixels on my 1080p screen.

For a 24" 1080p monitor in typical desktop configuration I get screen-door-effect. I can clearly see the black grid lines between pixels.

Also, if you can see aliasing/stair-stepping on this test then your eyes could benefit from higher resolution:

https://www.testufo.com/aliasing-visibility#foreground=fffff...