Keep in mind that iMessages _once backed up to iCloud_ are only encrypted if you have ADP. So that encryption is broken if/when you (or the person/people you talk to) back up to an iCloud account without ADP.

The one place where end-to-end encryption is “weakest”, ie where deployment rates are lowest, is *cloud backup*. This is, coincidentally, one of the best places for governments to obtain data.