Sure, most people think a window manager is just a window manager, and why should they have to edit the configuration file to put titlebars on the windows, for cryin' out loud?
But for a few of us, we jump for freaking joy when we see that. Holy cow! No titlebars! Think of all the extra pixels we get for actually getting work done!
The utility is in the choosing. Sometimes you want/need a window manager that lets you put windows exactly where you want them with zero chrome. And thank goodness there is finally a modern alternative to fvwm for that.