Yes, but given the choice, I think most people would opt for the less-efficient mouse navigation on a web page, even if there were no actual upsides to doing it

Yes, but given the choice, I think most people would opt for the less-efficient mouse navigation on a web page, even if there were no actual upsides to doing it that way. If a business forced a keyboard-only input method, then that might help to raise the efficiency of everyone more equally.