[AlexandrB]

It's great that they're aiming for this, but there's no reason to take them at their word until they actually ship something.

Also, considering that there are already multiple software vendors providing passkey hosting functionality, it seems a little late to start designing the "cross-device, and across passkey managers" part of this. If it's not in the standard already, what assurance does a user have that any of these third-party entities will implement it?