There's hope that a 4k screen option might exist, but anything between 1080p and 4k will not look good on Linux at this size. Without fractional scaling or funny supersampling tricks, Linux only really looks good at 100% and 200% scaling.

Maybe in time that will change, but that's just how Linux is for now.

Fractional scaling is a 99% solved problem at least on KDE, even with Wayland it seems to work fine for me. Just a few apps are blurry which I don't use.

PopOs - System76 distro supports fractional scaling.

...the GNOME/Apple hacky way, that is rendering at an integer multiple and then downscaling as needed. It works, but it's not optimal, and won't ever be as sharp as it could be.

The Gnome/Apple way is also apps can opt out when they do their own scaling, such as browsers, and can just stream the output directly at 1:1.

The fix, unfortunately, is blame the hardware. Desktop monitors that don't approach standard DPIs shouldn't be still produced in the 2020s, 24" 1080p and 24" 4k are perfectly common and optimal for their intended uses.

And yes, I think 27" 1440p shouldn't exist... it isn't an integer multiple of 1080p (thus a poorly handled edge case of scaling rasterized media resources, ie, videos), but also, if you wish to maintain proper intended DPI scaling for ye average asset, 1440p needs to be 32".

I use xrandr --scale 0.8x0.8 and it seems alright to me.

My screen is 2560x1600 and I use Fractional Scaling (125%) on Fedora/Gnome with Wayland just fine.