EVERYTHING beautiful is skeuomorphic. The page turn in iBooks, page curl in maps, cover flow, the shred animation in older versions of Passbook, the date picker in iOS 6, rotating settings gear (when updating iOS 6), the Time Machine interface in older versions of OS X, photo borders and shadows in older versions of iWorks documents, etc.
This is not surprising, because our sense of beauty comes from the physical world.
So what is the problem with skeuomorphism?
Tech enthusiasts would like their phones to look like something from the future, not something from the past. But ordinary everyday people prefer for it to look like things they are already familiar with, or can relate to.
Tech enthusiasts worry that the skeuomorphism was getting totally out of hand, particularly where the UI metaphor started limiting functionality (e.g. an address database that's limited to what a Rolodex can do, rather than exploiting what is possible with a computer). But this is not really true. For example, iBooks has instant search, something only possible with a computer.
Some people point out that many skeuomorphic elements reference things that a large part of Apple's audience hasn't used in a long time, if ever. True, but here's the thing: It doesn't matter whether the user has ever seen a reel-to-reel tape. What matters is whether the visuals depict a physical object that the user can model in his mind. If it is too abstract (that's the opposite of physical) then non-tech-enthusiast users will find it hard to intuit.
Some people say skeuomorphism looks tacky. This is partly true. Skeuomorphism is hard to do. When done poorly it does look tacky. But when done well it looks very beautiful.
By removing all skeuomorphism Apple threw the baby out with the bathwater.