iOS 9 is Apple's missed mission and I say this because in the spring of this year the first rumors regarding the new version of the operating system began to appear, saying that the engineers Apple Lossless Audio CODEC (ALAC), it focuses on solving the performance problems of the previous versions and on improving the performances.
If in terms of performance we can say that things are going well, in terms of solving problems we can say that iOS 9 it is Apple's missed mission because compared to iOS 8, the differences are minor in terms of solving existing problems in the system.
From spring to autumn we were repeatedly told that iOS 9 won't have as many problems as iOS 8, but everything was just a marketing campaign carried out by Apple through the various journalists it "keeps under its wing", the reality being different from the rumors.
iOS 9 is Apple's missed mission
From the almost complete problems with battery autonomy, problems with phone calls, problems with backups, problems with sudden shutdowns or Touch ID problems, iOS 9 is far from being a good version of an iOS operating system developed by Apple for iDevices.
If the previous major updates of iOS only had some problems with autonomy and certain functions, everything being solved quickly and easily by Apple, here in iOS 9 the problems seem to be bigger and more numerous than in any of the previous versions of iOS.
Moreover, the Apple company releases updates after updates at a fast pace and tests the beta versions 2-3 months before the launch, even if we are talking about intermediate updates, but nothing seems to help it solve our problems.
Unfortunately, I think that in the coming years the problems will continue in the same style because iOS seems to have become difficult to administer for the Apple company, so you cannot expect updates without problems.
