Lean communication is about adding value, briefly and clearly. You certainly don’t want to waste someone’s time, and you want to make sure that you are understood with a minimum of effort on the other’s part, but above all you must add value. If the other person gets value from the communication, they won’t begrudge the time and effort, and if they get no value, it does not matter how briefly and clearly you communicated. If the product is useless, they won’t care how little they spent or how conveniently it was packaged. Add value, and everything else will follow.