Re: When it gets to the point where you can use 'export DISPLAY=remotebox.lan:0.0' let me know
Ever used a GUI application?
Yes, regularly. My desktop machine at home runs Mint with Cinnamon (previously FreeBSD).
However, I've personally never had the need to run a graphical program on a *remote* machine. Web interface on say the router might be the exception (and it's not that remote, couple of meters maybe), though that's not a full XServer obviously.
In the particular use-case above, that of checking the status of a Raspberry, a GUI isn't required at all. If the use-case was editing video, that'd be a different matter.
In my experience, generally machines than have a GUI aren't remotely accessed, and remotely accessed devices aren't running a graphics server. I've never used the remote x feature despite now decades of using unixey systems.
I'll gladly accept that some people do use it, but I'll propose that they're in a minority.