I wonder whether I am splitting hairs here, but is using X11 over ssh, which is what I presume most people here are talking about, technically the same thing as using X11 network transparency? ssh simulates a local X server and transparently proxies everything to an X server on a different machine, where it pretends that they are local clients. So from the point of view of server and client, everything looks like it is local, except that X11 features which cannot be proxied are not available.
Of course I don't know how easy it would be to do the same thing with Wayland. Presumably the Wayland protocol itself would not be a problem, but the proxy server would need at the least to track and proxy graphics buffer updates on the machine actually running the application, or alternatively intercept and proxy operations on them. The last might be tricky given that there are no restrictions on what interfaces can be used to access the buffers, but actually for most situations the first should be good enough. (I keep hearing noises about Kristian Høgsberg being working on something like this, but I haven't heard any about it being usable yet.)
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