Wayland can use RDP and some other remote desktop protocols, but it is not what I want, I want a window, not a desktop. There is Waypipe now, I heard it works fine now, but I am still doing "ssh -X", because it just works.
The problem with Wayland is that it is very much "batteries not included". To all the things that worked well in X11, the response has been "it can be done, our protocol is very flexible, ask the guys writing the compositor", not "that's how is done". The result, Wayland is 18 years old and it is only starting to work well, with some pain points still remaining, and display forwarding is one of them.
It is funny you mention a "reasonable path" by the way, as it is exactly that problem, I don't want a "reasonable path", I want it to work, and after 18 years, I think it is a reasonable expectation. To their credit, it seems we are getting there: waypipe, and now window managers, we may finally have feature parity.