I disagree that skeuomorphism is only about taste. It's not just a skin, it also removes and limits functionality. I can even give specific examples. If you have lion, go to your address book.
It probably opens and lists people on the left with their details on the right. It looks like a book. Can you group people? It's certainly not obvious that such functionality (which is useful!) exists.
Now click the red bookmark thing on top. Not very intuitive. It looks like a bookmark, not something that switches to a different view. Anyways, viola! The grouping interface! But now I can't see contact details. I need to "flip the page" back to see the details. This is a huge step backwards and is so inefficient that I completely stopped using groups when I moved to Lion.
Now consider Mountain lion:
http://6.mshcdn.com/wp-content/gallery/apple-os-x-mountain-l...
Hey! It's the three column view from the old address book! Now I can see my groups, contacts, and details, just like before. Not as skeuomorph though. Now it's just an app that is skinned to look like a book. It doesn't function like a book. There are no pages to flip. It still has the dimensions of a book I guess, but that only makes that left page looks mighty constrained.
UI is about displaying and working with information, and this skeuomorphism is arguably not a very good way of doing either. I can lodge similar complaints about iCal. For instance, why are months always on separate pages? When I'm near the end of a month, I have to keep switching back and forth (with a slow unneeded animation on top). It's a computer, surely we can come up with an interface that discards this old page limitation of paper calendars! Not if you are thinking with skeuomorphism though.