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It sounds like people’s biggest knock against passkeys is that where they are stored is siloed to the Apple or Android ecosystem, so when a user changes platforms, they have a hard time accessing. 

This seems fairly edge case, solvable via a migration tool, and not a good enough reason to lose the ease of passkeys.

100% an edge case. Apple’s security for passkeys is incredibly strong.  Credentials managers are also an option with only slightly weaker security with easy portability. 

A helpful article outlining the security of passkeys in iCloud Keychain

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100% an edge case. Apple’s security for passkeys is incredibly strong.  Credentials managers are also an option with only slightly weaker security with easy portability. 

A helpful article outlining the security of passkeys in iCloud Keychain 

https://evmbrahmin.com/blog/iCloud-keychain-passkeys-guide.html