Not to mention how the Keyboard preference pane allows one to assign custom keyboard shortcuts to any menu item of any application, even when the app’s dev neve

Not to mention how the Keyboard preference pane allows one to assign custom keyboard shortcuts to any menu item of any application, even when the app’s dev never included or intended such functionality. As long as the app hooks the native menubar, it just works. Combined that with enabling tab-highlighting of any onscreen control and I’m not sure how macOS lags behind in keyboard control. You can’t quite do system wide vim bindings or anything crazy like that (though hacking around with Hammerspoon would get you close), but that’s going to be difficult with any setup short of a bespoke Linux desktop with a customized WM and very selective set of applications.