In addition, it being cryptographic could mean that you no longer have to share any more data than necessary. Let's say that you want to implement age verifica

In addition, it being cryptographic could mean that you no longer have to share any more data than necessary. Let's say that you want to implement age verification - all you need is for the card to sign a challenge saying that the user is old enough (which the backend can verify based on public keys published by the government) without having the card reveal anything else.