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The Wizard and His Shell
(terminal.click)
A community for everything relating to the GNU/Linux operating system
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Original icon base courtesy of lewing@isc.tamu.edu and The GIMP
Fully keyboard accessible GUI goes TAB TAB TAB ENTER.
That's better than nothing, obviously, but I wouldn't call pressing tab repeatedly the epitome of good keyboard-driven UX.
It's good for repetetive tasks & muscle memory compared to clicking. Lots of industry, banking or form entry (like in airports) is done with keyboard only GUI.
I was referring specifically to "tab only GUI". I'm sure a proper keyboard only GUI can be great.