alt Hacker News> To get a good terminal UX, I think the answer to this is probably to throw all that compatibility mess away and redesign a modern terminal protocol that bakes in accessibility, regions, scrolling, selection, proper keyboard, etc.
Why not just… a GUI framework or layout that’s meant to be keyboard driven and information dense?
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Countless reasons.
Invent a gui client environment that is universal, works the same way everywhere, over any kind of channel, and is already implimented and supported everywhere, and utterly weightless in all dimensions (ram/cpu/network), and then you might be able to ask that question without it being incredibly ignorant.
Today the closest you might be able to say is web/electron, which is gross on all counts. If anything the closest is X11, which is not remotely close enough.
That's why not just...
TUIs run on any OS with minor patches to support quirks, GUI frameworks need a lot of work. TUIs don't need to follow any OS guidelines, cross-platform GUIs always look bad outside of the "main" platform.
If you're only targeting macOS/Windows/Gnome/KDE then the solution is easy: just grab a GUI control set and go ham.
Then there's remote access: you can spawn an X11 app through X forwarding and have a terrible laggy experience on Linux, you can use RemoteApps on Windows to have a good remote experience (but almost no other platform), you can use VNC to have an awful cross-platform experience, or you can use a TUI and have all the graphs and interactivity you need over a responsive, low-bandwidth connection on any combination of client+server.