not a software dev, but a linux user and a stout technology enthusiast.
I have 3 monitors setup on my primary workstation. Two landscape in a stacked arrangement, it's just tidy and works well enough for a secondary media display, organizational monitor. And then my third is portrait for anything i keep long term tabs on, chat programs, music player, system resources, etc...
I recently switched from KDE to i3wm, and i find i need inherently less monitor. i3wm does all the sorting organization and bullshit i hate for me automagically, it's perfect for opening a terminal to check something, or work on something real quick, and being able to have one static window, and two tabbed/stacked windows on one monitor is HUGE. Super nice for terminal breakouts with a browser for documentation. If you're ever balls deep in a config and testing shit actively, you'll immediately understand how much of a godsend it is.
Anyway, floating window managers are dead and anything shipping a floating window manager is a dead product on arrival.