Earlier quoted context omitted.
Social niceties serve as a grease that makes the social interaction go smoothly. By avoiding those and being frank and direct you only introduce sand in the mechanism. There was a wonderful quote to this effect a while ago on HN but I can't quite find it.
I don't really understand how not going directly to the point can be better, for any mechanism.
Small talk and social niceties aren't merely hot air, they are tools you can use to assess a person's mood, what they are interested in or comfortable discussing, or even whether it is productive to discuss something at all. Consider it the metadata of conversation.
Also consider that conversation is two-way communication. You reveal information about yourself not just by the answers you give, but by the questions you ask.