A crucial point not mentioned yet: cross cultural issues. In an American culture, it is "self-evident" that clear communication is about being direct and to the point. But this is far from universal. More generally, western cultures tend to conflate earnest and truth. "Telling it like it is" is valued. We don't realize our own "phoniness". I have witnessed countless times people hitting a wall in meetings and other s…
I'm an American and I think one mistake we Americans make is that we think we are very direct, but there is a lot of indirectness in some of our communication habits. This is particularly true in other parts of the country. As a native born midwestern, there are some indirect habits there and I'd say the west coast as its own too. So we're mostly direct, but there is some indirectness that we are at times blind to.
Try to get a direct negative response in USA, good luck.
I only realized the indirectness of my second sentence after I wrote it.