You're missing the point, GP is talking about a level below the DEs, namely the graphics stack, which if unavailable or inefficient makes any discussion about the DEs moot since the GUI may very well be unusable at all in practice.
In that regard the "Windows desktop" has plenty of favorable points and "macOS desktop" is just stellar because it has had a comparatively perfect track record of driver support including a compositor since forever.
With a VESA/OPenGL/Quartz software render fallback many people on the Hackintosh crowd have been using OS X on unsupported cards via software fallback and not even notice they weren't getting the full Quartz QE/CI, which is nothing short of astonishing.
This is the signature attitude that points to the point being missed, what good is conky or awesomewm or ratpoison or xmonad or openbox if I can't make tearing and rendering artifacts disappear nor get proper colour management or sane HiDPI support? (PS: Xinerama, I hate you)
As for the DE experience on other platforms, Windows has had a kinda-tiling WM that regular people do use in the form of AeroSnap, while macOS is now getting tabs-in-the-window-manager, and Exposé+Spaces that evolved into Mission Control has been a positively brilliant experience for years.
Meanwhile on Linux, the very fact that you have to massage it into something useful ever so slightly at every level is, to me, a telltale sign of its deficiencies. Things are getting better (wayland, drm2), but they're getting better on the other platforms too. The best part is that nobody's standing still and things are moving forward (hopefully, as from the outside it looks like Linux people are running in circles these days around, so I hope reinvented wheels are getting rounder).