This impacts free + IAP models also. Here's the classic use case:
1. User gets a shiny new iPhone.
2. User installs my (free) AwesomeApp on new device.
3. User is missing premium AwesomeApp features, is now confused about why.
4. User goes to IAP part of app and tries to recover the IAP/premium features, except Apple's UI here would lead user to believe they are being charged for the IAP again.
This is often followed by:
5. User contacts support and is very confused. Support cannot verify whether or not user owns the IAP, because the App Store is a black box and we get no information about purchasers.