What makes Linux appealing to me is the extent of customizability, but I didn’t find many answers when looking up with desktop environment is them most customizable. Some say KDE is most customizable than say, Gnome, but doesn’t Gnome support CSS customization while KDE doesn’t?
I don’t know if it was ever true that one was more customizable than the other. Maybe back in the early days of GNOME Shell or GNOME 2 you could say KDE was more customizable but right now it doesn’t matter. KDE has like 451 million options ootb while GNOME has approximately 451 million extensions so it really boils down to which one you like more.