Icons that strongly resemble things from real life are, quite often, problematic at representation, especially in smaller sizes. They take more time to understand and decode, they're prone to confusion.
But anti-skeuomorphic icons also have a problem of their own: they become so abstract that quite often we don't know what they represent. They become cold and soulless, like corporation logos. An example: I look at this new icon and what I see is Darth Vader with an open big mouth.
It is like comparing IKEA furniture and Bauhaus or Scandinavian design against Art-Noveau or Antonio Gaudí's architecture. The first are (as Nietzsche would say) apolinean, elegant, subdued and functional. The second are dionisiac, fun, a feast for the senses.