The problem with passkeys, beyond the painful UX that will scare any casual users away and the fact that they are being wielded as an extreme vendor lock-in mechanism is just that the design and implementation is so over complicated with second system syndrome.

If you’re going to push a replacement for passwords and want it to be universal, it should be EASY to implement. Even if the backing cryptography is complex, the actual handshake / implementation shouldn’t be. TOTP as an example is insanely easy to implement. Password auth of course is as well, despite needing to know what you are doing to get it right. Both can easily be handled entirely without JS.

I should quite frankly be able to just <input type=“passkey-public-key”> in a standard POST form for registration and be able to call it a day. It doesn’t justify how complex it is to set up.

A fitting password replacement should just be as smooth and easy as ssh. I give a website a public key, I use my private key. I manage my private keys however I see fit. I don’t need a third party involved holding my private keys hostage.