As someone else pointed out, security is a good reason to upgrade, since iOS 10 hasn't seen updates for longer than a year and since iOS 12 is a performance foc

As someone else pointed out, security is a good reason to upgrade, since iOS 10 hasn't seen updates for longer than a year and since iOS 12 is a performance focused release. At the same time, I hate the change that came with iOS 11 for WiFi and Bluetooth in Control Center. Toggling them only disconnects them temporarily, and doesn't turn the radios off. WiFi and Bluetooth will automatically reconnect if you go to a different location or at 5 in the morning local time. So Control Center is useless if you want to turn off the radios (to save on battery, depending on your location and other factors) and/or want control on when and where they connect and/or want to stay off the grid on your own terms and also enhance security. You have to go to the Settings app to turn them off completely or use Siri, and neither of these actions are as easy to do as using Control Center. This behavior remains the same in iOS 12 too. When this change was added in iOS 11, EFF wrote an article about how harmful this new behavior is. [1] That said, some (or many) people do like the new behavior in iOS 11, where they don't have to remember that they turned off the radios and want to connect automatically. For security's sake, especially when you have a device that's capable of getting updates for several years, it's better to keep it up-to-date. [1]: https://www.eff.org/deeplinks/2017/10/ios-11s-misleading-ish-setting-bluetooth-and-wi-fi-bad-user-security https://www.eff.org/deeplinks/2017/10/ios-11s-misleading-ish...