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?
Dwm is a really customizable window manager. You just need to know C and write everything yourself!
The most customizable DE will always be “any WM” 😄