That I said does not support your statement.
> A syncable credential is by necessity representable in clear text at some point.
I never said this was wrong.
> WebAuthn is a _superset_ of Passkeys
I don't see how your quote illustrates this, and I've only heard them referred to as the same thing. Would you care to elaborate? And maybe provide an example?
> multi-device credentials (commonly referred to as synced passkeys).
> A backup eligible public key credential source is referred to as a multi-device credential whereas one that is not backup eligible is referred to as a single-device credential.
The previous name for single-device credentials was "resident keys".
So yes, providing a way to export and back up the Passkeys was _literally_ the intention of the WebAuthn authors from the beginning. The ability to export and sync passkeys was not a temporary accident, it has always been intended functionality.