Haha, YES! Perfectly stated. Surely, when you are negotiating with landlords honed communication skills are of great assist, and generally in all your examples here
To not become pulled over the barrel is indeed a good skill to have, and this starts with communication. But yeah, even when I prefer saying nothing in more personal relationships, and let others have their learning lesson, this is also a kind of a communication method.
ALL is communication! :)
All is communication, even when you decide not to say anything, a silent communication.