I know you know but it's worth pointing out to other readers, it's a spectrum--there's lots of variation between the poles. I routinely test as an introvert (INTP) on MBTI tests, yet test as an extrovert in the first letter of the "Big 5" favored by non Jungian psychologists. Just for example, I hate small talk yet I often love parties. I love the energy of the crowd at a sporting event. I also am perfectly happy walking alone in nature. The testing assigns whatever letter of whichever pole one is closer to.