On a non-HiDPI display (I use one that is 1680 by 1050 and one that is 1280 by 1024) fractional scaling works fine on my machine running Gnome 34 with apps that

On a non-HiDPI display (I use one that is 1680 by 1050 and one that is 1280 by 1024) fractional scaling works fine on my machine running Gnome 34 with apps that bypass XWayland and talk directly with Wayland (which is true of all the apps I use). (Google Chrome needs to be started with a couple of command-line switches to bypass XWayland.) But your comment makes me hesitate to buy a HiDPI monitor!