I don't think being blunt is more efficient. First, adding a few "kind" softener words do not really take so much time, don't you think so? Second, efficiency i

I don't think being blunt is more efficient. First, adding a few "kind" softener words do not really take so much time, don't you think so? Second, efficiency in human to human communication is not only a function of raw information density. Adding well chosen "kind words" may allow the reader to get some context and a better understanding of the message. A simple example: say you already communicated with the guy in the past. If you add a reference to this previous communication, the reader will remember you better and adjust the frame. There's so many things passing through language, many are very volatile but still important. We're not computers. Human language have very little in common with computer languages.