Except you can't bind every menu item: some menu names are dynamic, so you can't bind to them, and not all the keys are supported, and there is no left/right modifier differentiation. Also, you have to retype the full command path by hand, which is insane, so you can't do that either (you should be able to just hover over a command and press keybind to rebind)

Even with the awesomeness of Karabiner Elements there are some unfortunate limitations

But yeah, I'd be surprised if it were a powerful system, that's so rare in the keyboard land...