I... Am not sure how I feel about it. On tech merits, this absolutely makes sense - the tech is slinging private keys around, and their secure storage is a hard problem.
On the practical merits - maybe? Token-backed decryption of the password manager's database seems like a devent solution? But does this happen? Is there a password manager which uses the public key derived from FIDO2 token's on-chip private key to decrypt the database?
On-token storage is limited (though 100 passkeys on a YK 5 Nano is fairly generous) - but what if we just used the YK as the "Private key is here and ONLY here" setup?
I kinda like the OFFOAD+ design - it promises to show me to where I am authenticating. With origin binding should be a nobrainer, but still, it speaks to me.
I get what they're saying but device bound keypasses are brittle. List device lost account. So you need multiple devices. Passkeys are just a bad solution to a valid problem.
https://keepass.info/help/kb/yubikey.html talks of different ways of doing something like that, but I've not played with it yet.
Another option is just to store passkeys natively on the token itself?
