Yeah, fractional scaling is absolutely the one thing that I miss on Linux. On X11 it's too slow and laggy. On Wayland I have... Wayland issues.

I don't entirely love MacOS (mostly because I can't run it on my desktop, lol). But it does fractional scaling so well, I always choose the "looks like 1440p" scaling on 4K resolution, and literally every app looks perfect and consistent and I don't notice any performance impact.

On windows the same thing, except some things are blurry.

On Linux yeah I just have to bear huge UI (x2 scaling) or tiny UI (X1) or live with a noticeable performance delay that's just too painful to work with.