[floatboth]

No, it's not like setting font size. Actual fractional scaling as done by macOS and Wayland compositors is rendering at 2x and downscaling.

e.g. 1.5 scale on a 3840x2160 display means you have 2560x1440 logical pixels (3840x(1/1.5) = 2560), applications render for 5120x2880 (2560x2=5120) and get downscaled for 3840x2160.

[enriquto]

Ah, mon dieu! This is the first time I read about "logical pixels". It is horrifying.