Can you elaborate a bit more? If I create a passkey on https://passkeys.io on my Mac, then store the passkey in a password manager like Bitwarden, I can log into that site on my phone. I was kinda under the impression that Bitwarden stored the private key on their servers, so if their site gets hacked, then the attacker has access to my passkey.io account?

Agree…it’s sough to argue against that. However, it’s a big hill to climb as tons of HTs have something proprietary built in, and I don’t think anything has M17 available?