I think his point is from a user perspective, what benefits are there to such a system in real world scenarios.
Basically what Dan did is similar to explaining how SMTP, POP3, MTA, and MX works for email. Now ask most people how each component works for email, and they'll tell you:
Uh, I don't know. In the TO line, I put my mother's email address. In the subject line I put "hi mom" and then I type what I want to send.
What could EOS do better, than existing technologies out there (from a USER perspective only). That's going to be the key thing to explain.