And another thing: In the long-time limit, there is no redundancy in nature. There is no it doesn't do anything, it's just to look good in the real world. It's all there to feed the gestalt baby.
(All my going on about nature, evolution, interfaces and so on isn't some thinly veiled commentary on the complexities, to-and-fro-ness, loopbacks and meaning in my life, by the way. I am just going on about nature, evolutions, inferfaces. And so on.)