[fastball]

I suppose the issue with centrality is that not only can it indicate that you are both good at being an extrovert and good at being an introvert (when appropriate), but it can also indicate that you are bad at being extroverted and bad at being introverted when arguably called for by context.

I think what MBTI lacks is an appreciation of context - sometimes it's good to be Thinking, sometimes it is good to be Feeling. What individuals need to learn is 1. when each is appropriate and 2. if they're bad at doing one or the other, getting better at it.