>So, let's run a few calculations. The "retina" resolution is based on a pixel size of 1 arc-minute, that's 20/20 vision, at 30 degrees, that's 1800 pixels. 4k is 2160 vertical, so that's about the limit of human vision. So, basically, 4k is what you want at any size.

No, because I don't want to move my 32" monitor further away to get that 30 degree viewing angle. The reason I have a 32" monitor for work is to have more screen real estate. A 30 degree viewing angle works for watching movies and stuff, but when I use it for coding, I essentially have multiple 30 degree viewing (on-screen) windows.

You might say "ok well just get two or three monitors", but that isn't the same either. Besides the space between the monitors, with one large monitor I can subdivide my screen space in any way depending on what I'm doing, where each window has a 10-30 degree viewing angle or whatever.

>you can notice discontinuities at a much higher resolution (vernier resolution), but it only matters if you don't have anti-aliasing.

That's just not true though. It does matter even with antialiasing, the difference is clear. In particular, the dell xps 15 2019 has a ~290 dpi OLED, which has high contrast.