Socially, it's another matter entirely. There are obligatory communications that you really can't reasonably dodge, like planning family Holidays, or finding a friend to join you to a concert, or calling around to get a decent price on a set of tires.
Then there are the real small-talk situations. Standing in line at the coffee shop, sitting with another parent you've never met waiting for your turn at the parent teach conference, the bored bartender while you're trying to relax the last evening of a business trip... These opportunities have different payoffs that really depend only to you. If you're an extrovert, a conversation with a stranger may be invigorating. And yes, you might learn something valuable, or offer some advice that genuinely helps a stranger. For me, there is simply no payoff. The investment of awkwardness versus the comfort of remaining withdrawn is just not worth it. Once in a while, I might be in a particularly good mood and actually strike up a conversation. But that is a rare moment for me, and I usually end the conversation thinking that the last thing I said for sure came across as weird and they had no clue what I meant... So usually, I want to remain in thought, or distracted by some type of entertainment or doing something that I deem to be productive. Thank God for my iPhone.
I'll satisfy my obligations to society in other ways.