To me, what is new is that after iOS 7, I began not to upgrade up front on a major iOS release. The later the version of iOS, the longer I tended to wait. For iOS 10, I didn't upgrade from 9 until 10.3.1 was released. But of course, you can't say my attitude to update is something new or a bump in a curve. All I can say that there are more and more people around who try to do the same as I do, which can be described as a trend.