1Password also supports passkeys. I'm not sure if you can share them in a family vault, but considering they're just "passwords" in 1Password, i don't see why you wouldn't be able to. The portion of a passkey stored on device is just a private key, which is essentially just a string of bytes.
The built in password manager in iOS/MacOS also supports synchronizing passkeys across devices (via iCloud), and again, i'm not sure if you can share those passkeys between uses, but same argument as for 1password.
This still doesn’t solve requirement 2, at least as far as I can tell.
I’m a 1Password user. There are times I want to login with one of my personal accounts on my work laptop, auxiliary device I have, or family member’s device. On all these occasions, I’m not going to install 1Password and sync down my entire vault, just to delete it 5 minutes later. I simply reveal the password in my app and type it in. With passkeys there is no way to do this. It’s an edge case, but an important one.
I’d feel much better about passkeys if it wasn’t some mysterious thing locked away in a vault. If it’s effectively a public/private key pair, I should be able to see the private in my password manager and copy/paste it wherever I want, and however I want. If I could do this I would instantly understand what’s going on and be more accepting of it, though I’d expect I’d still run into some edge cases.
That assumes the device/app I’m logging into supports that. It also assumes I have my password manager on a device that can scan QR codes.
Are passkeys ubiquitous? It doesn’t feel that way. Tech demos are nice, but they’re just tech demos. When I’m doing my taxes I don’t want to find out I can’t download my data in TurboTax because I can’t login to my bank with a passkey via their app. Or maybe I want to use some old hardware, where the apps haven’t been updated with QR codes and passkeys, I guess I’m out of luck.
Too many edge cases. They are trying to sell passkeys as a magic way to login. I’m not going to entrust my ability to login to magic.
Also, scanning QR codes to authenticate feels very janky. Isn’t that why CurrentC failed? No one wanted to do a QR code dance with their phone.
The built in password manager in iOS/MacOS also supports synchronizing passkeys across devices (via iCloud), and again, i'm not sure if you can share those passkeys between uses, but same argument as for 1password.