We all know this is mostly meaningless.
The real 'feature' of webAuth is 3rd party attestation.
Your bank and soon every other service will see how 'cheap' it is to fight spam and abuse simply by restricting accounts attested by [apple,google,microsoft] and nobody else, specially 'None' like this one.
When you talk about webAuthn that is what you are talking about in the end. 3rd party attestation. Which in the end will be the end all "privacy respecting" (/s) advertisement profiling tech in the years to come.