It's crazy reading the back and forth in these comments. It seems each side (pro-X11, pro-Wayland) always gets something wrong about the other. Makes it hard as an outsider to figure out what's true.
FWIW as a regular user of Linux desktops, fractional dpi scaling is very good on Wayland and sucks on X11. That's been the main thing driving me to want to use Wayland.
I'm a total noob when it comes to graphical Linux environments, but isn't the issue with scaling caused by the applications themselves? Like GNOME only accepting integer scales, etc.
Setting X11 DPI worked just fine for me to achieve exactly the scale I want.
FWIW as a regular user of Linux desktops, fractional dpi scaling is very good on Wayland and sucks on X11. That's been the main thing driving me to want to use Wayland.