This is a prime example of what is, it seems to me, one of the absolutely core misunderstandings of the wider Unix world.
GUI does not mean, imply, or require a mouse. The original Mac and Lisa were mouse-centric, yes, but folks, that was 40 years ago now and the world has moved on.
You can use a modern Mac entirely without a pointing device, via Voiceover, which is built in to all Macs, iPhones, iPads, etc.
Windows has been amenable to being 100% keyboard driven since Windows 1.0 in 1985 and I have been using Windows primarily by keyboard controls since 1988.
This is the standard method of computer interaction for millions of blind computer users around the world since the 1980s.
What's more, the Windows keyboard UI strongly influenced IBM CUA, which in turn was informed by the mid-1980s Apple Human Interface Guidelines, and that influenced OS/2, DOS from 1990 or so onwards (so MS/PC DOS 4 and later), and that influenced Xfce, KDE, GNOME 1/2, and most other xNix GUIs.
It is only the shell oriented xNix world that has refused to adapt.
Console-mode shell-only Linux text editors such as eFTE, SETedit, and Tilde all have the third-of-a-century-old standard UI and can be used 100% with the keyboard but also have menus and dialog boxes.
The standard design of basically all 21st century GUIs (except for the handful that are intentionally different – GNOME, Pantheon, Unity) does not need graphics. It does not need a mouse. It can be, and still today is, sometimes implemented entirely in text mode, it works on dumb text terminals, and it was universal in 1990s DOS, OS/2 and other native x86 OSes.
The result of the refusal of the xNix world to even notice this is happening has absolutely crippled the field of editor design on xNix.
In all other fields of software, text editors moved on from the awful and terribly dated design of Vi and Emacs by the late 1970s. See this interview with Larry Tesler, who invented cut/copy/paste as a computer UI.
https://worrydream.com/refs/Tesler_2012_-_A_Personal_History...
This means that there are something like a million times more users out there happily editing text every day with editors with better UI than the absolute top-rated shell editors on any xNix.