To pile on against X11 over ssh, forwarding on a modern Linux workstation is spectacularly painful. I recently needed to forward a lightweight gtk app from one workstation to another over 10gbe and a single switch hop.

With ssh and X forwarding, my local gnome constantly threw up modal dialogs that the forwarded window was unresponsive, forcing me to keep clicking "Wait" to dismiss the modal, then quickly interact with the forwarded window before the next "unresponsive" modal popped up.