To be nitpicky, if the X server crashes, you're just as hosed with X as with Wayland. The difference is that X survives a window manager crash, whereas Wayland

To be nitpicky, if the X server crashes, you're just as hosed with X as with Wayland. The difference is that X survives a window manager crash, whereas Wayland typically does not, because on Wayland it's usually the same process as the server.