Comment by Aachen

Yes, but they'd have to issue another one of these snooping demands to either the app's developer (there's loads of developers so this would get out of hand quickly) or to Apple to patch the build or read the memory or something to get the unencrypted data

This current demand isn't blanket access to your device, it's access to things uploaded to Apple's online storage service. Having to get a backdoor that works with every app's encryption takes a lot more work while running the data through an authenticated encryption algorithm is relatively trivial for a developer