Earlier quoted context omitted.
How do you even draw such a connection in your head? Nobody once, ever, has said that the new UI that came with ICS was a bad thing. The problem is that even now, years later, the most in-use Android version is three years old. Android fragmentation is about VERSIONS. APIs, bug fixes, security updates, and available features to a lesser extent. It has NOTHING to do with look and feel. At all. This tactic from Android…
Did you read the post? Fragmentation is about your userbase being split across incompatible platforms and the paralyzing effect that has on development, which is precisely what Marco was lauding as a good thing in this post.
That isn't fragmentation. iOS 7 is still compatible with apps written for iOS 6 and iOS 7 apps will still work with iOS 6. The same cannot be said for ICS apps running on older devices. Even in-house apps like Chrome are ICS or bust. Even now, multiple years later, the most popular version of Android won't run Chrome or any other ICS exclusive apps.
However, iOS 7 apps will LOOK & FEEL out of place on iOS 6 and vice versa, which is where the disruption occurs. This isn't fragmentation, and no amount of arguing will make that the case.
On top of that, with the notable exception of the iPod touch 4, all iOS devices sold for the last four years will run iOS 7. That means this period of disruption will last for six months to a year, max. Once again, no fragmentation.