The sandboxing of mobile apps - at least on iOS - was always sold as a feature that respected this handheld computer was also a phone, and needed the voice chat

The sandboxing of mobile apps - at least on iOS - was always sold as a feature that respected this handheld computer was also a phone, and needed the voice chat reliability of a pre-smartphone. If you have any suspicion that installing an app will cause your phone call with your grandmother to be interrupted, you will really scrutinize what you install. Early Android devices tended to have more problems than iOS devices when it came to phone calls getting interrupted, so whether this was marketing making an excuse for something Apple wanted on s technical level, it seems sandboxing was with the use case of "keep the phone working" firmly in mind.