Is it? I've seen us going from obvious skeuomorphism to more and more abstract shapes, until we hit peak Windows 8 hubris where everything is a coloured square with a monochrome symbol in it. Then back to icons where shades of colour and contrast finally start meaning things again, but getting stuck in an endless balancing on the edge where icons are abstract enough to confuse but not clear enough to describe their function. We've never gotten fully back to actual skeuomorphism.