Same as the don't have access to your iMessage messages ... unless you happen to use iCloud which they purposefully make really inconvenient to not use.
Yes Apple is willingly staying quiet about your iMessage backup being accessible by them. But it does not change the fact that iCloud Keychain is end-to-end encrypted with Apple incapable of accessing your keychain.
When I first learned about the iMessage backups being accessible I was a bit let letdown by Apple. But I never believed they were best in class for privacy. The iPhone's true strengths lie in the OS support and FaceID.
iMessage itself is pretty slick but if I want privacy, I use Signal. It also gives me a crossplatform messenger as I prefer Windows and iOS.
Same as with Microsoft Edge. It's my favorite browser now, but I do give up a bit of privacy for convenience. If I want the best privacy I use Tor Browser. Which I always keep installed with Signal.
I would expect passkeys to be a massive liability for Apple in case they get breached. Why would they even want access to them? Do you think they want access to your accounts?
I think they want to provide the "I forgot my password and lost all my devices" convenience. People hate loosing their data and loosing access to a lot of passwordless services would be a nightmare. In general I'm super weary of anybody who promises to have no access to my account and then offers any reset password functionality.
