[dailen]

I believe the point is to destroy traces of the information, not to prevent retention. For example, I often work with a few associates in a seperate country and there's a MASSIVE language barrier even though they speak english. We use randomly generated passwords so telling them the password over the phone seems about impossible. Theoretically this allows me to securely send them a password that they can easily record for future use. Transmission or storage of passwords over cleartext is generally what you're trying to avoid.