Comment by chrismorgan

On the specific topic here, fractional scaling, macOS gets it disastrously wrong, only supporting downscaling, which means that it’s impossible to get pixel-perfect output on fractional scales, which are the norm on most of their devices. I seriously can’t comprehend how they ended up going that way, given that they were the ones in a position to force developers to get things right, far more than Windows, but no, they just didn’t even try. On the contrary, Windows has worked with fractional scaling from the start of its high-DPI story, and although it did take a while to get it right in all circumstances (I think the last pieces came in 2017, with DPI_AWARENESS_CONTEXT_PER_MONITOR_AWARE_V2 and also incidentally GDI scaling to automatically improve most older, DPI-unaware apps), it’s been robust since on all but a few badly-made apps that claim DPI-awareness but actually lack it (and you can forcibly change how they behave if necessary).