It's just a false issue. You generate more key pairs when you have more devices. You get a new pw manager? Revoke the old ones and generate new ones. You get a

It's just a false issue. You generate more key pairs when you have more devices. You get a new pw manager? Revoke the old ones and generate new ones. You get a new device? Revoke the old ones and generate new ones. Passkeys are a commodity. It was a benefit that keys were device locked until the brain trust told you it was user hostile.