Why does it need a phone? It's like SSH keys, you just need access to your keys from where you are logging in. They give the example of using your phone becaus

Why does it need a phone? It's like SSH keys, you just need access to your keys from where you are logging in. They give the example of using your phone because that's a convenient portable key vault you may have with you. But if you want to keep your keys just on a desktop or in some other password manager that integrates with the browser I don't see any barrier to that. 1Password for example has already announced passkey support.