In these discussions, where there is fierce opposition on this question, wouldn't it make sense to explicitly filter for this on hiring and have some companies that look for [for lack of a better word] extroverted people, and others for introverts?

Sure if you work in an industry where you're competing among a very small pool of highly-skilled specialists, you can't afford to miss out on key talent. But if we're talking about web devs for a start-up, why not?