On using passkeys and whether it would replace passwords.
One thing not mentioned in the video is some services have 2FA not allowing to save more 2FA devices. When You lost your Yubikey You practically locked out yourself from the account. A combination of Yubikey and passkey is a workaround. If one is lost, you still have the other available. However, the importance of the account should always be taken into consideration.
https://odysee.com/@AllThingsSecured:9/what-the-%21-%21-are-passkeys-%28-should-you:e?r=7CxAaRKHPPJJuJHs9EkyswAKzUpzeZ6g