personality is much more complex than inputting agree or disagree.
Yeah I mean no stuff right but we have useful clear-cut defined definitions for what "Introverted" and "Extroverted" means and we understand how to identify these traits, because we defined them. If you show more introverted traits than you do extroverted traits you are considered introverted. That's just
basic logic.
It's not pseudoscience because it's not science, it's data and statistics, which can be
used in science.