Comment by modeless

I'm less concerned with whether it is technically opt in or opt out and more concerned with whether it is commonly enabled in practice.

What would resolve my objection is if Apple either made messages backups E2EE always, as Google did and as Apple does themselves for other data categories like Keychain passwords, or if they excluded E2EE conversations (e.g. from ADP people) from non-E2EE backups, as Telegram does. Anything short of that does not qualify as E2EE regardless of the defaults, and marketing it as E2EE is false advertising.