You have a valid point regarding complexity as such. However, I don't think the model itself is useful at all. It is hardly more than a deck of tarot cards. People take the test, which of course has poor test-retest reliability, then they start applying the predictions to themselves getting caught up in a wave of confirmation bias.

I don't think it is useful to teach people that personality is a set of labels. We all have a intuitive understanding of personality, which is much deeper and gives a more nuanced picture.