We need to go further. If a service doesn't include 197 factors including blood samples, showing up at a physical location 50 miles from your home, and sending a picture of yourself in a specific posture, and doesn't require you to use at least 53 of them (determined randomly) to login, then it's insecure and should not be used.

Passkey are more like password managers, and less like MFA tokens - despite the fact that many passkey implementations can function as MFA tokens as well.

Bitwarden the password manager includes a full passkey implementation, which doesn't involve any MFA.

Password managers are those proprietary programs that you need to install, give full access to your computer, register an account and trust their word that your passwords are uploaded to the cloud securely? No thanks.

Also they are too complicated for an ordinary user. A physical key is much simpler and doesn't require any setup or thinking, and can be used on multiple devices without any configuration. And doesn't require a cloud account.

If you like password managers, you'll love passkeys!

Passkeys is an interface between your password manager and a website without all the fluff with filling or copy-pasting passwords.