I'm not even so much complaining about GNOME, which these days has actually
reverted to something much closer to a classical desktop metaphor that is equally suitable for technical users and noobs...
But every other group of people with a new GUI idea that thinks "Nope, we're gonna reinvent the wheel and make a new weird GUI just because". Linux on desktop is already what, 1% to a max of 2% of desktop market share world wide? And then you have people building weird stuff on top of xorg or wayland that is used by one percent of that one percent just for the sake of being different.
If it's intended and promoted for technically sophisticated users to play around with? Sure, great idea I suppose, the more the merrier. But so many of these concepts are pushed as a "better, easier to use, more user friendly for noobs" GUI, when in fact all it does is split the market and confuse the end user. In particular I'm thinking of the various efforts that have been made to clone the MacOS user interface, including the Dock.
I should note that my opinion above also applies to Windows 8/8.1, which was clearly a misstep, as evidenced by Microsoft returning to a much more classic desktop environment design for Windows 10. At least they acknowledged what went wrong and backed away from it.
Sort of like a GUI version of this: https://www.youtube.com/watch?v=bsFzc0wAtFs