Tim Cook has recently stated that users may be allowed to delete the preinstalled applications on all iOS devices. Many people have complained about not being able to uninstall many different apps like Tips, Podcasts, or the Apple Watch app for those who do not have one.
According to Apple's CEO, giving this ability to all iOS device owners is more complicated than many would assume, as many of those applications are connected in some way to other apps, and removal could cause issues. Many also believe the 16GB version of the iPhone is far too small, as the standard for most smartphones seems to be now generally 32GB, and the ability to delete preinstalled apps would help mitigate the capacity problem that some 16GB iPhone owners may have.
Many smartphones now feature expandable storage too, and as iPhones have routinely resisted this feature, allowing users to control exactly what apps they have could be a huge help. Apple has also addressed capacity issues in other ways as well, such as making the iOS 9 update require only a single GB rather than the iOS update which required 4GB in order to download and install. For Apple, iOS 9 is all about efficiency, and the move to allow all apps to be uninstalled is a step in the right direction.