You can't run X11 programs on Wayland without Xwayland.
Likewise you cannot run Wayland programs on X11 without a wayland compositor like Cage (a wayland kiosk) or Weston. Both run as a window on X11 inside of which Waydroid works just fine.
It's an odd complaint that incompatible software is incompatible.
You read the parent I was responding to, no? You're reinforcing my point.
"Users who don't know about the feature can just use a pre-configured system like Mint Cinnamon and never know about any of these things."