It would be, if everyone agreed on a toolkit. As it as, at least X11, AFAIK Wayland, and Windows/RDP ended up just throwing pixels over the wire because every program renders text/menus/whatever differently.
For example, I'd say that I need:
A dropdown for a single option, with options: A, B, C
And let the device itself decide what needs to be displayed in the native GUI toolkit. Then just send that specification over the wire, instead of needlessly wasting the bandwidth on lots of pixels.Actually, I think I'm just describing an analogue to HTML with the equivalent of CSS provided by the platform, but for native desktop toolkits (hopefully without the complexity of a browser engine).
RDP doesn't perform even 0x better than the competition, like parsec.