I think a lot of it has to do with the somewhat complicated engagement protocol, if everyone assumes that nobody else wants to talk then it's easier to just keep your head down and at best nod or even avert eye contact but when someone extends a level of conversational courtesy I think people often respond in kind. My challenge is that I don't often have the impulse to break the ice but when I do and feel genuinely outgoing people tend to appreciate the chit chat even if it's just about the weather but I also have many moments of standing awkwardly in elevators silently ascending or walking down the street silently and even feeling awkward ordering food. Being able to consistently be outgoing I feel would be a net positive but I'm not sure what the trick is to just turn it on without it feeling forced.