I think you're forgetting about the four rules the author seeks to satisfy: 1. I can’t use an account from an existing online service. 2. It needs to be useab

I think you're forgetting about the four rules the author seeks to satisfy: 1. I can’t use an account from an existing online service. 2. It needs to be useable for a non-technical person. 3. Its flow has to be consistent across platforms. 4. No junk in the middle.