Somewhat misleading. Because these days, none of the network transparent primitives are used anymore. All the rendering happens server side, and bitmaps are sent over the wire. It's basically a crappy VNC. And at that point, just use RDP or VNC
Just last week I was debugging remotely an art installation which uses my software, https://ossia.io and was running on a Pi 5, I compared X11 and VNC and X11 was really much more useable even over the internet.
On wayland from I am also getting good results with waypipe opening individual apps from VMs to make it a poor man's QubeOS without the complexity and without having to open the whole remote desktop.
Even if this were true (which it isn't), there's a lot more to a GUI than the G. A lot of nice interoperability is provided too, like clipboard integration, dragging and dropping, mixed windows on the same taskbar, etc. Far more pleasant to use than awkwardly going to a full screen thing to get a window out.