(Getting to the point:) I once heard a perfect explanation of the small talk phenomenon. It's like two modems establishing a link: they send to each other signals that are intended to asses how the line behaves, how well the other side hears you, and what it supports. Thus small talk may never be a pithy conversation: its purpose is to be a formal, predictable, zero-surprise exchange. Skipping it and going straight to the point may result in a badly botched communication attempt.