You cannot just change the definition of a word to suite your argument. Most people consider skeuomorphic design to include both looks and behaviour. Regardless, what I've described is all looks. Address Book still has grouping functionality. It's just been made extremely difficult to use because of the design of the interface.

Further, looks are about much more than just taste. Designs affect how easy it is to understand the information being displayed, or to understand how to use an application. Skeuomorphic design is typically used to try to improve the latter: help people to understand how to use the app. It mimics a physical object because people already know how that object works. This benefit disappears if your skeuomorphic design doesn't actually work like the object it mimics though.

Tensor's point, which I agree with, is that Apple's choice to use skeumorphism has impacted functionality, and is not a good design principal at all.

I would also argue that a lot of their designs look downright ugly to be honest.