We don't more than Plasma, Gnome and Xfce.
>One of the interesting aspects is that the What's New article discusses some of the problems facing the maintainers of distros based around GNOME and Gtk tools, especially since the GNOME 46 release.
In hindsight, all this could have been avoided. Mint's Cinnamon, Ubuntu's Unity (and to a lesser degree, Ubuntu's current Gnome-based desktop), Solus's Budgie, Pop_OS's (current, Gnome-based) Cosmic desktop - all of these are fighting against Gnome, trying to make a sane desktop based on Gnome technology. All of these should have instead pivoted to Qt or even just added their manpower to KDE, fixing bugs, adding features, and shipping their distro with a customised version of Plasma that shows their idea of a desktop.
The question that needs to be asked is: "Why did you try to create a new desktop based on Gnome, when you think Gnome is doing it all wrong and will fight you every step of the way?"
Xfce and Mate, while also GTK-based, have the excuse of being older than Gnome and a fork of Gnome 2, respectively, so they have their own raison d'etre.