On everything but plasma 5.26+ Applications running via xwayland are scaled in a fashion that makes them blurry when the desktop uses scaling eg high dpi, furthermore if you have monitors A and B which use different scaling the X app can’t be scaled differently on each monitor like X apps can be under X nor like Wayland apps are under wayland. If you use a single 1080p monitor you wouldn’t have noticed any of this but its ridiculously common if for no other reason that there are shit tons of high dpi laptops and low DPI external monitors