Ariadne explains some of the reasons behind this “Wayback” thingy (rootful X11 on Wayland):

• https://social.treehouse.systems/@ariadne/115147291885663574
  
• https://social.treehouse.systems/@ariadne/115147331909980717
  

They should put this in a FAQ on their website or something. The whole endeavor makes more sense when you look at it like this.