I use tons of GUI apps with mostly a keyboard (or sometimes only a keyboard). For example, my Git client of choice is Tower, and I’m able to get all my work done without taking my hands off the keyboard. It took me a bit of time to get used to the shortcuts, but now I’m able to work off my muscle memory.

Well written GUI apps will always have good support for keyboard-only use. This is doubly true for apps that care deeply about accessibility, since some people have disabilities that make it hard for them to use a mouse or trackpad.

On the other hand, TUIs will never support non-Latin scripts properly, or have good support for screen readers, or be easily discoverable without a manual, or have uniform automation support using native automation APIs. In my view, CLIs are strictly inferior to GUIs unless you’re putting together data pipelines.