> Windows is the only one that does this properly.

How can you say this when applications render either minuscule or gigantic, either way with contents totally out of proportion, seemingly at random?

I don’t have to pull out a magnifying glass to notice those issues.

These were probably written against the old-school Win32. It's pretty easy to fix.

  Right-click on the `.exe`
  Properties
  Compatibility tab
  Change settings for all users
  Change high DPI settings
  Under 'High DPI scaling override' section, tick box for 'Override high DPI scaling behaviour. Scaling performed by'
  In the drop-down box below, select 'Application'

For MMC snap-ins like `diskmgmt.msc`, `services.msc`, or `devmgr.msc`, there's a Registry key you can set. See this ServerFault question: https://serverfault.com/q/570785/535358

The 'doing it right' part is from how it should be done, but it still needs application support.

The thing is X11/Xorg can also theoretically do the same thing (and most likely Wayland too) but it needs, you guessed it, application (and window manager / compositor) support.