This is part of a push from Apple to move users' data from devices to the cloud. They're doing the same thing with photos (optimised storage deletes local copie

This is part of a push from Apple to move users' data from devices to the cloud. They're doing the same thing with photos (optimised storage deletes local copies), videos, and documents on iCloud. The advantage for users is that your data is available everywhere you have an apple device and Internet. The disadvantage is a corporation manages and controls increasing amounts if your life, private and public, and leaving them for another becomes unthinkable, and of course the corporation chooses what information it is appropriate for you to rent access to.