Well, because there
will likely be devices with all of these new animations. Google, HTC, Samsung, Sony, LG and to a lesser extent Motorola (near stock UI) all released devices in the past year running 'stock' Android. Nobody's making you choose the devices that are skinned and they're not the only option available (though I understand this is less true outside of the US).
People tout the
openness Android and all the benefits it offers--well, that means it's open to all kinds of implementations--gotta take the good with the not so good.
----------
Agreed, and the brief demo I saw on video today looked pretty nice.
What I am curious to see is how loud the uproar is about the the new 'heads-up' notifications which seem to be the Android equivalent to iOS's banner notifications, something I've seen proponents of Android's system of notifications rail on since its implementation on iOS. And to be honest, they seem even larger and more intrusive on Android.
Don't get me wrong--I really like these two elements being added to Android--makes it the complete notification package, so to speak, IMO.