Not the original poster but here are two issues I currently have with EXWM (have been using it exclusively for about two months now): 1. If Emacs hangs/pauses,

Not the original poster but here are two issues I currently have with EXWM (have been using it exclusively for about two months now): 1. If Emacs hangs/pauses, the window manager hangs/pauses. Can't really do anything in X so have to switch to a virtual console. 2. GIMP stopped bringing up working file dialogs. I think it is some EXWM configuration change I made. You might also have issues with tooltips/popups depending on your EXWM configuration.