[c0nsumer]

...yet at 4K native on macOS (OS X) I could see fringing. And it was worse than using a slightly lower resolution, scaled up by the OS.

And it's particularly bad on solid color lines and high contrast borders (not fonts). So... that doesn't work for me. Which was the point of the post; I don't like how this particular subpixel pattern OLED monitor looks and it's not for me.

[DiabloD3]

Which applications? Are they ones using non-native text rendering?

Chrome, for example, do not use Core Text. Chrome (and all Electron apps) are habitual offenders for bad text rendering on all OSes, not just OSX.

[c0nsumer]

Numbers.app, Autodesk Fusion, Adobe Illustrator, and Terminal.app were the first places I noticed it. And in Fusion and Illustrator it's not text that's the issue but lines/graphics.

And high contrast edges in photos in Apple Photos looked wonky.