One reason to use it is Emacs Server. Basically, even when I have multiple open Emacs frames (window-manager windows) they are all actually instances of the sa

One reason to use it is Emacs Server. Basically, even when I have multiple open Emacs frames (window-manager windows) they are all actually instances of the same Emacs processor, sharing the same buffers. This offers many advantages, but means that I can't really use my window manager's multiple desktops for Emacs like that.