That introduces new friction to setting up a new device, which is worse than the case with passwords.
You can use the same passkey for multiple devices (for example with keepassxc as authenticator that handles them), but it reduces security same as for example with using ssh private key that's not unique per device.
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You can use the same passkey for multiple devices (for example with keepassxc as authenticator that handles them), but it reduces security same as for example with using ssh private key that's not unique per device.