I think you misunderstood me. I'm not saying being able to identify someone is bad, just that it should be tied to what actually matters. When you're opening

I think you misunderstood me. I'm not saying being able to identify someone is bad, just that it should be tied to what actually matters. When you're opening a bank account or something, you don't care if that person buys beer, and it makes no sense for the same identifier to be used for both of those things and for a multitude of other random things. That only invites a great deal of trouble. You care about whether they have the collateral they claim or the job they claim and things like that, each of which could have their own unique identifier signed by the employer or similar. At each need for identification, the possible correlations need to be considered and minimized.