Meanwhile in Linux the scaling is generally good, but occasionally I'll run into some UI element that doesn't scale properly, or some application that has a tiny mouse cursor.
And then Windows has serious problems with old apps - blurry as hell with a high DPI display.
Subpixel antialiasing isn't something I miss on macOS because it seems pointless at these resolutions [0]. And I don't think it would work with OLED anyway because the subpixels are arranged differently than a typical conventional LCD.
[0] I remember being excited by ClearType on Windows back in the day, and I did notice a difference. But there's no way I'd be able to discern it on a high DPI display; the conventional antialiasing macOS does is enough.