> unlike passwords, there is no good provider migration story

I'm curious what the "good provider migration story" you're referring to here for passwords is?

Password managers by-and-large haven't agreed on a standardised interchange format for import/export - a few of them have some compatibility helpers for importing from specific popular competitors but they're all in different formats, no consistent formats.

The above goes for passkeys as it does passwords - import/export will include your passkeys - so I don't see much difference in the provider migration story.

On the other hand, the FIDO Credential Exchange Format does solve the above problem (if/when providers choose to adopt it), so passkeys are at least further along the path of creating a "good provider migration story" than passwords ever were.