There are a couple of problems I have with that. 1) Many websites limit the number of passkeys I can link to my account. Some only allow 2 or 3. I have more devices than that. 2) If I am supposed to create a new passkey for every device, how do I login in the first place? Most websites currently fallback to password login which defeats the security benefit of using passkeys in the first place.

I currently only use passkeys for a few websites that have awkward password login workflows or do not autofill properly from my password manager. I just have a single passkey for each that is synced via Bitwarden. Currently, I see passkeys as using an electronic biometric lock on the front door while passwords are still regular locks on the backdoor. The biometric lock on the front door does not do much for security when the backdoor still exists and I have come across very few websites that support only allowing passkeys. And those that do still run into problem 2 listed above.