I think that kind of under sells it. Yes Apple had all sorts of existing technology they could leverage. But they still built a completely new spatial UI paradigm for it.

And an entirely new interaction model that hasn’t been seen before. Using looking at something to replace a mouse isn’t new but taking that combined with using a pinch gesture to “click“ and some of the other things they’ve come up with is a unique combination that seems to work quite well. Thought there is certainly room for improvement.