[kkfx]

Trezor support FIDO2 tied on the seed phrase, so if you lost it another hardware wallet will works issueless once restored.

[miladyincontrol]

On a similar note mooltipass can export an encrypted backup of passkeys. That said platform should support multiple passkeys so if you lose access to one you arent screwed over.

[kkfx]

In the end we are talking about "smart-card-alike" auth, something there since decades, cheap, functional, safe and apparently ignored by most.

Curiously biometric crap is not ignored as well instead, and is pushed by any means...