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Passkeys Explained: The End of Passwords
(sentientrant.com)
This is a most excellent place for technology news and articles.
The promise of passkeys when i first grad about them was that it would be quick and easy - that you wouldn’t need to enter a username or use 2fa. The reality appears to be that this is that it’s used ** as** 2fa
Most of the sites I've seen use it as the single auth source. That said, using multiple forms of authentication in a layered model only improves security.