How do you justify this assertion of yours? I would contend that the most efficient method is written down and shared widely in a doc. Otherwise, everyone is relying on their memory of what was spoken. For anything non trivial, I would want it written down.

Did you remember to consider commute times, context-switching costs, office overhead and facilities staff overhead in your efficiency calculation?

Reading is significantly faster than listening. Writing is significantly more precise than speaking. You're gonna have to write information down so that it's not lost anyway.

speak for yourself