You're missing the point. Myers-Brigg types are most useful for understanding other people, not for understanding yourself. Before I read about the other Myers-

You're missing the point. Myers-Brigg types are most useful for understanding other people, not for understanding yourself. Before I read about the other Myers-Brigg types, I just didn't understand why certain other people made decisions as they did, e.g., a member of a group insisting on a worse outcome for everyone to punish someone who'd offended them. I mean, it just wasn't logical! You see, I was trying to understand/predict others' behaviour by projecting my own personality onto them. Much better is to understand/predict someone's behaviour based on how someone of their Myers-Brigg type would behave. If understanding how others are different is what Myers-Brigg types are for, then the division into 16 types makes sense. It represents a trade-off between having too few types (and not having predictive power) and having too many (and having to learn too much information of less relevance).