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?
Nothing is stopping you from making a terminal with a very niche command running on the background 24/7 and call that a “window bar” btw, so… as long as its a minimal installation, “they sky is the limit”. :^)