[kevincox]

IIUC the macOS approach is functional but not perfect. I believe it renders all apps at a high resolution (higher than the highest attached display), then the compositor downscales them to the display. This means that apps are using more resources to render and are unable to render pixel-perfect.

I believe that on Wayland the apps are told the scaling factors of the monitors that they are on (or the compositor can scale them if they don't want to switch resolution or are across multiple monitors).

AFAIK apps can't work around this very easily (if at all).