Yeah, so much of in-person interaction is attempting to suss out the size and orientation of the personal Overton windows of your counterparts so that you can both find the overlap and take a peek through to the other side without sticking your whole head in and having to hear and smell the sights too. Walking around "with the shutters open" can speedrun things a bit, but it isn't practical in many contexts (work, community events, etc) or for people who have a public image. The whole point of smalltalk is to avoid being pulled into public largetalk, not because people are incapable or have no ideas about larger things.