I have a FIDO like stick that stores my passkeys so I don't know what you mean by biometrics. Probably the fact that phones can also store passkeys?
Discussion
My main exposure to passkeys has been with my old iPhone, and it was always asking for my Face ID or fingerprint, so I've never even considered using them anywhere else.
I've also always just assumed the physical devices like YubiKey relied on fingerprints, but I guess I've been mistaken on that... 😅
They rely on physical touch, but not fingerprints.
What stick do you use? Is it a full passkey, or just a physical 2FA key?