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How does that work for identical twins?

The same way as it does now. The face is checked against the identity claim, not against the global lookup, which can't reliably work anyway.

So there's no non-repudiation making it no different than a paper document.

Sorry I can’t really parse the comment, but I do agree it’s no different from a paper document, because why would it?

It's hard to think of any scheme that fully works for that, unless you mandate distinctive body modification like tattoos or scars.