You are conflating design and under-the-hood changes. I have seen absolutely nobody complain about the new APIs you mention, even though they might need a few iterations to work - just like 10.7 did. That is fine, that is how Apple has always worked. Apps that were quick to embrace features of 10.7/10.8 have always gotten a solid push on the Mac App Store, for example.
What annoys many users (and every developer is also a user) is change for the sake of change. There is absolutely no technical reason for changing the style of icons on iOS 7. Clear fit right in on the iOS 6 home screen and was a joy to use regardless.
That is true but do the new APIs offer something that would cause some revolutionary re-think and remolding of a vast majority of apps in the app store?
Sure the new APIs might offer some great features for apps and I am sure they will definitely be used in the majority of upcoming apps, but my problem (maybe not problem just curious observation or minor annoyance) is Marco taking a completely nonobjective stance on the iOS7 changes. I am completely ok with his opinion but the blind hyperbole is a bit annoying.
What annoys many users (and every developer is also a user) is change for the sake of change. There is absolutely no technical reason for changing the style of icons on iOS 7. Clear fit right in on the iOS 6 home screen and was a joy to use regardless.