Germans are direct. They say what they mean. And they mean what they say. Germans do not use euphemisms to soften a message. They believe in using unambiguous language and getting to the point. For Germans direct communication is honest, transparent, efficient. Being direct reduces the risk that people will not understand each other.
Americans approach important topics carefully. Euphemisms help to communicate uncomfortable messages. Ambiguity can be helpful. Depending on the sensitivity of the topic, Americans will address it indirectly. In the American context indirect communication is considered both polite and effective. Most importantly it maintains the dialogue in order to deepen it.