That's because introversion/extroversion is really only one single axis. The Big 5 personality index includes 4 other axes: agreeableness, openness, conscientio

That's because introversion/extroversion is really only one single axis. The Big 5 personality index includes 4 other axes: agreeableness, openness, conscientiousness, and neuroticism. What you're discussing is only partially described by extroversion. Highly agreeable extroverts may not enjoy large group discussions because of the inherent conflict present when multiple people express opinions. Highly conscientious and low opennness introverts may not even like 1:1 discussions because they're so very sure that their existing opinions are the correct ones. Humans are really bad at multi-axis categorization. We like things to be good/evil, black/white, etc. But anything worth categorizing almost certainly needs to be categorized across multiple indices.