hi its always much slide-showed at apple marketing events: some version of "this iOS version was the fastest adoption of an iOS system to date. already (substitute very high)% of iOS users are on our latest iOS operating system." then, sometimes a slide showing the android fragmentation across its android updates. then a wink and a yuck yuck. and a self pat on the back. and it is true, too. as far as the statistics go. but whats really clear is also clear that as apple pushes its iOS adoption to all supported devices, whats also true is that if the device itself is a newer device, the latest iOS update usually improves performance. but this does not seem to be the case for some kinds of updates. updates that include network performance or network locating or battery control tweaks. for updates that include these kinds of updates, its debatable if apple is really doing its users of older hardware any good for these kinds of updates. from the comments in forums like this, it could be said that older hardware does reach a point where iOS updates may in fact not be able to be tuned so well to the hardware in the older devices. leaving to wonder, at what point does it become better to not upgrade to a later iOS version. i wonder how google is going to handle its own updates to android on its own pixel device going forward. apple's tweaks to older devices can bring important security updates, etc, but it must be always thinking primarily of the experience on its newer, more powerful devices first, and care less about degradation of performance on its older devices with slower processors. so fragmentation is occurring. not in terms of OS version number. but in terms of achievable performance. apple seems to be putting in as high power of a processor as possible with each newly released hardware, and this gives additional life to the hardware to be sure, with it being able to handle later iOS releases.