Agreed that is helpful to address. However, the article talks about an 'or' model or an 'and' model, completely failing to take into account the actual model that people use — that you either gain or lose energy from social interactions, what I shall term the 'bullshit' model of human interaction. This article fails to address those that believe that, but does help to remove the dichotomy for those that believe in the superficial shyness/outgoing nature of introversion vs extroversion.