Going to have to disagree with you on this. AirPods and the Apple Watch both came out under his watch. But the biggest area of expansion for Apple is going to be in software which has seen a ton of innovation in the past decade (Cloud services, payments and a whole slew of improvements to the OS) which all happened under Cook's watch.

Airpods, apple watch, m1 processors. I'm sure there are others but I've bought and enjoyed a bunch of new apple products since Tim Cook took over