As a die hardcore kde fan I am not of a fanboi enough to admit that Gnome has the best HiDPI multi-monitor wayland fractional scaling support of any DE I am aware of.
Isn't gnome scaling only by whole numbers? Or did they get the fractional scaling out of experimental status? (Ubuntu 19.04 still had it as an experimental mutter setting)
HiDPI support is more than setting a font size for the task bar. The tricky part is getting application windows to rescale their UI as they're moved between screens with different scaling factors (e.g. from a notebook screen with high DPI to a projector with low DPI).
So the parts of the UI that are i3/dwm scale. Everything else like email, browser, image editing, applications, the stuff that actually matter, doesn't.
Sure, if you only ever need a text editor you don't need to care about scaling anything but fonts, but that is not the case for most people and unrelated to which WM or DE you use.