LinuxBBQ

How is this not a thing already? WM's are bloat!

Oh, yes, details!
~/.xinitrc reads: exec emacs -fs.
Really, this is just me playing around. There is no practical reason to do this.

Oh yes of course, this works if the application supports some kind of 'maximize' or 'fullscreen' function. -fs you say? Probably -mm does something similar, too (don't have emacs at hand now). Or of course with geometry entry in Xresources...

Looks like a nullWM session :D