From reading the bug, they don’t support iCloud backup, which is surprising to me, since I thought supporting backup was trivial on iOS.
As the bug points out, they could use core data sync for people that are navigating using multiple devices.
I believe all of the above supports transparent E2E encryption at this point.
(For backup, there is a toggle, since E2E makes your backup useless if you lose the only device that contains your keys, and many people only have one apple device, and don’t want to bother enlisting their friends to secret-share their recovery key).
As the bug points out, they could use core data sync for people that are navigating using multiple devices.
I believe all of the above supports transparent E2E encryption at this point.
(For backup, there is a toggle, since E2E makes your backup useless if you lose the only device that contains your keys, and many people only have one apple device, and don’t want to bother enlisting their friends to secret-share their recovery key).