>>17794746
MBTI is a mutilated extract of Jung's work that was designed to be deployable to average people.
Jung does describe the introvert and extrovert types for simplicity of approach. But he also makes clear that everyone is simultaneously introverted and extroverted on a range of psychic aspects. That is, it's a question of which encounters a person will pursue and "live into" or which will he retract from and internalize.
E.g. the general introvert on 4chan is actually extroverted when it comes to exploring the content of 4chan.
In any case Jung has to read directly because there's too much to properly describe via summarization. And yes, I'd say he ends up being right about a lot of things but not in the neatly packaged ways that people want. It always requires explanation since it's about our complex psychology and not mere facts, which by definition are neatly packaged descriptions.