iOS 8.4 has recently been released by Apple. The main problem about this is that its users realized a lot of unlikable changes. First, the introduction of the Apple Music streaming service can create mess within your iTunes library. The Home Sharing was said to be destroyed as well. And the worst part is, downgrading the OS is not possible. Meaning, if you are already running the iOS 8.4, you can no longer go back to the 8.3 OS. It's not exactly a bad thing as it can be considered as Apple's quality control strategy. Maybe they just wanted to make sure that all systems are updated. Well, that is all fine, until users realize that the speed is no longer very efficient.
During the previous updates, Apple allowed their users to return to a previous version, as long as they do it within 1 month after upgrading. This allows the users to find bugs and unpleasant changes and decide whether they like the previous version better or not. But in the case of iOS 8.4, Apple shut down the possibility of downgrading to iOS 8.3 just a week after the release of the new version.
It is a very big mystery why would Apple do such a horrible thing. But if we go back to the quality-control-theory, we may assume that Apple simply wants everyone to learn to live with the 'minor' changes and simply get over any complaints they have. Eventually, everyone may get the hang of using the new version - a version which Apple thinks is great. After all, they would not cut off the possibility for a downgrade if they know that iOS 8.4 isn't good enough for its users. For all iOS users, we should just get over any separation anxiety we have with the older iOS version and just move forward as how Apple would want us to do.
For problems and bug fixes, Apple keeps their information public to help its users get informed as to how they should deal with the changes.
