Shoutout to all the ambiverts! Don't set too much stock by the MBTI, but I reliably come up with with a 50/50 for E and I... and then I'm strongly NTJ.
My ambiversion was highlighted to an extreme degree during interviews. At my interviews I would flip to full extroversion and relished talking to new people, befriending strangers, etc. Once the interview was over, like a light switch, I just wanted to hermit myself away and have minimal human interaction.
Either way, I think it takes a mix of all personalities to flesh out a good medical school cohort. A class entirely composed of strong extroverts would be a nightmare.