Just read this http://macperformanceguide.com/AppleCoreRot-intro.html and thinking to share with everybody. Please read it in full before comment.
Many times it also mentioned Windows 8.
My feeling is that 'consumerism' is driving those changes, no matter which company we are talking about. This leaves all those 'professionals' in the dark, no matter which OS.
On another point, you can see clearly there are people anti-short-release-cycle in the Apple world, yet Windows will do the same soon (Windows Blue).
Waiting your deep thoughts...