It's pretty annoying that Gnome themeing tools, rather than developing and becoming better/more cohesive, were made totally irrelevant
I can't quite understand how "Linux GUI, make it look how you want! Personalized OS!" became "Linux - this one unchangably bland tablet UI on your desktop!"
I know that other WM/DM exist, but Gnome is incredibly popular, often the default, and was so close to being what people saw as the ideal Desktop.