I absolutely disagree. The whole reason I'm using Apple products is that their software has always been incrementally refined, never "revolutionised", like Windows 8 or Ubuntu's Unity or whatever. OS X 10.0 and OS X 10.9 look almost the same and so do iOS 1 and iOS 6. If the form factor of my Mac changes, it does not make any app on the system look ancient, and it does not negatively affect usability.
I'm being facetious of course, but really, Apple changes their designs up on the regular, even if it isn't "broken". See: the iMac product line.