The Apple apps are using Core Data, which uses SQLite as its persistent store by default. So Apple could in theory migrate away from SQLite by changing Core Dat

The Apple apps are using Core Data, which uses SQLite as its persistent store by default. So Apple could in theory migrate away from SQLite by changing Core Data’s behaviour without any application-level impact. So in a way, these applications are already decoupled from SQLite in the way the parent comment suggests.