I mean, its 2021 and you still cannot fractionally scale the resolution without slashing your battery life and losing 30% of your processing power (and some random stuttering on all applications).
Having a 15.6" 1080p screen basically means i need to choose between using my glasses all day or using Windows.
Use Wayland. Fractional scaling works fine there. If you are using X11 and xrandr scaling, and see performance impact, maybe that's the reason why it is not supported in GUI.
On the other hand, I'm have no perfect eyesight, but in Linux, 1080p at 14" is as usable as Windows 10 at 125%. Here, the design choices made by Gnome are hitting its strong points, it is perfect resolution for @1X scale.
It works both ways; it will live as long, as "linux is useless, because I had a problem with wifi in 2002".