Until this situation is fixed, the KDE Wayland session is not usable for me, and I would not be able to recommend running a Wayland session to a new Linux user. Because of this, I would have to tell any potential user with a mixed DPI setup to stick with Windows or Mac OS until these display issues get ironed out.
The current status of XWayland applications in both Gnome and KDE
Wayland implementations leaves something to be desired, especially with
regards to HiDPI scaling. Currently, all XWayland clients are upscaled
by the compositor, which produces horribly blurry results for many
popular applications like Jetbrains IDEs, any Wine/Proton game, and some
common Electron apps like Discord and Teams. Those same programs are
able to scale just fine on a straight X session. There is already an AUR
package that contains the necessary patches for XWayland on Sway:
https://aur.archlinux.org/packages/sway-hidpi-git/ Indeed a similar fix
was implemented two years ago in this merge request:
https://gitlab.freedesktop.org/xorg/xserver/-/merge_requests/111
- Fixing XWayland HiDPI scaling Alex Bujorianu
- Re: Fixing XWayland HiDPI scaling Nate Graham
- Re: Fixing XWayland HiDPI scaling Nate Graham