It's ridiculous that they're so poor in messaging exactly what this account system entails.
There's approximately four months left until this system is in place, why do you need to know this right now?. Also, this presentation was not meant for consumers; in fact, they haven't yet said a word about Nintendo Account, My Nintendo or Miitomo in any consumer-oriented context yet. They should, and they will, but once again I don't see why it is "ridiculous" they haven't spilled the beans already. For what it's worth, seeing as it is still pretty far away, details may not even be finalized yet, and if so it would be risky to say too much at the moment.