Yes, we have amazing retina displays capable of showing more detail per square inch than anything in history, and we use them to show vast spaces of pure white with an occasional gradient or single colored word. There are literally no details whatsoever to benefit from retina except very crisp text. Even rounded corners, which could finally look truly curved, have been replaced by sharp corners.
Now, when our devices could finally look the most alive, the most tactile and interactive, the most real and inviting ever, we have completely detached and disassociated them from anything our brains instinctively recognize and want to look at or touch.
I actually agree with this in parts iOS 7 is a work in progress but some of the changes have been ordinary, this latest change is quite horrible putting it mildly, iBooks and Newstand were the only two designs I wouldn't have changed, and I don't like the the iCloud and the other symbols on Safari either.
I updated this morning and was appalled at what greeted me, I have never felt like that about anything Apple have done.
I am all for plain but add a bit of colour or let us tweek it