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Unless you're using one of the proprietary desktop OSes then you have to use one of the proprietary mobile OSes.

https://developers.google.com/identity/passkeys/supported-en...

No you do not need to use anything proprietary to use WebAuthn. There are open source software[0] and hardware keys[1].

[0]: https://github.com/psanford/tpm-fido

WebAuthn supports attestation of key storage and site owners might choose not to trust keys coming from an unknown DIY device.

Fortunately that feature isn't used outside of enterprise environments. Apple's passkeys don't support it so there will not be any mainstream adoption for requiring an attestation cert.

Assuming desktop Chrome doesn’t support third party password managers like 1Password and Lastpass that are similarly part of the FIDO alliance.

Passkeys aren’t a Chrome feature they’re a Webauthn feature. So if Chrome doesn’t provide the features you want on your platform you should be able to use another browser / password manager combo that does.

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