Honestly, they should be keyboard first. Yes, let all the mouse stuff work as normal, but choose keys so that the fastest way to navigate the app is with the keyboard whenever possible.

Why though?

The way we are moving I believe soon we will be talking to the websites not just clicking or typing around...

Spin up a Windows 3.11 and later instance to try this out.

to a man with an LLM everything looks like a nail

Yes and no. The big advantage of a GUI is having interactive 2D coordinate input support (aka a pointer, or gestures.) While I think a keyboard can be a great control surface, that’s one thing it really lacks and only GUIs really offer. So to enforce that the whole GUI must be keyboard-drivable requires limiting the major advantage of the GUI. I’m a fan of the Emacs or Plan9 styles where the keyboard and pointer are able to be used together synergistically. You also see some of this in tools like video, DAW, and 2D/3D graphical scene editors.

I quite literally cannot remember anything I've ever read as simple and correct, on the topic of UX/UI as this.

I tend to deride UX/UI as almost a joke because it nearly never understands that fashion and science are different things.

This one gets it.

yes please ! even AI would appreciate this !

ain't no way my mom is learning vim

I am sad to see what happened with GTK. It seems gtk2 was the last good GTK version. Then it went downhill from there.

No.