True, that new mouse may work better -- and certainly has more cool factor -- than a typical multi-button mouse.
True also that the embedded ball is better than a scroll wheel.
But to say that people "don't really want buttons at all" is playing word games. No one who asked for a four-button mouse would have been satisfied if you gave them a four-button mouse with all of them mapped to the same action.
When people asked for more buttons of course they really wanted a "richer way of expressing [their] intentions." And Apple -- and Apple defenders -- spent all those years saying, "You don't really need them. And if you do you can always buy a multi-button mouse from someone else."
Are we really supposed to believe that for all those years Apple was saying, "You don't really need more buttons," that they were confused? That they thought people just wanted more buttons that didn't do anything?