pacman -Qqem to list your foreign packages (usually AUR ones)

Accurate thumbnail picture

Well yes, but my point is that one can intuitively can use regular DE’s and be productive, the same is not true for window managers. Regardles if one configures or not.

Remember about cognitive effort, window managers are for people looking to invest time in learning keybinds and new workflows, Plasma and Gnome do a better job of satisfying a bigger userbase and most workflows are easy to port to another desktop environment.

In my opinion that makes Plasma and Gnome the best desktop environments, no matter how much I prefer standalone window managers.