SSh forwarding does not simulate a local X server. It simulates a network X server running on localhost.
This is significantly different.
A local X server can use all sorts of shortcuts like shared memory for communication, while a network X server, even one talking to localhost, requires all the same infrastructure that you have to do true network transparency.
the Wayland interface is explicitly NOT able to be sent over a network, it requires local-only interfaces.
The suggested approach of using VNC is the situation where you have some process that simulates the display side and then ships the results elsewhere.
This is exactly the point that concerns so many people who routinely use the existing network transparency.
I remember running Quake over X in the late 90's, the only problem I had was that I hadn't bothered to try remoting the audio, so the sound came from the server two cubes over from me.
Saying that X is unusable for anything is just incorrect.
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