You go to country X (USA sounds good to put in here).
You get mugged.
They take your phone and keyring.
They can't do anything with it since it's locked, but you don't have it.
Aren't passkeys great?
They can’t do anything with it
I have a backup key at home
Mission accomplished
Wouldn't I have the same problem with passwords? I would lose my phone and be unable to two factor log in to my Gmail account or bank from someone else's device?