> It's not like not having that permission would stop Apple from accessing them against your will, as they have access via the OS anyway.

This presumes the OS is something other than a bundle of apps.

Does the filesystem driver have access to your photos stored in the filesystem? Naturally. As would a third party filesystem driver, e.g. if you wanted an app to let you plug a USB drive into your iPad and use NTFS or ext4 filesystems or use various network filesystems.

And then the obvious question is why Apple should be able to give iCloud or its filesystem software access to things the user can't give Dropbox or some open source NFS app permission to do. Or why the user can't deny that permission to the Apple code, or remove it, when they want to use a competitor instead.