GNOME generally seem to have struck a nice balance over the years. Icons has a reasonable amount of skeuomorphism without too much hyperdetailed textures, most icons has distinct shapes (not just a bunch of boxes with rounded corners).

I used to rice my linux desktop, but havefound less reason to do so the last ~5 years, and have been happy using the defaults in Fedora. I spend most of my time in a terminal, the browser and a few select GTK utilities apps, like Switcheroo, Curtail, Netsleuth etc.

Maybe it is the somewhat slower, more iterative pace of GNOME, compared to macOS an Windows, that ends up with a more balanced end result?