Psychologists seek empirical evidence, make hypotheses and test them. And openly publish their results in peer reviewed journals for criticism and falsification.
I am the first to criticise psychology on the grounds that it doesn't have the equivalent of a periodic table or a theory like general relativity or like quantum mechanics or like a theory of natural selection.
So I would say that psychology it like biology before the Origin of Species and the discovery of the structure of DNA.
However great strides have been made in neurology. And we can now watch the brain working in real time.
And of course we can collect empirical data and analyse it with statistics.
And so far there is no overall psychological theory. But then there is no over all theory even in physics. So we keep learning and looking.
But MBTI is a false lead. It is not even wrong because it is not falsifiable.
However MBTI is popular across the world.
My objection to it is the same as my objection to Islam in that both believe in the supernatural and magic.
And in my opinion the supernatural and magic can best be understood metaphorically.
And I must say I really like metaphor because metaphor operates on three levels of generality whereas literal description operates only on one level.
They say poets create religion, prophets abuse religion and priests do it to death.
Even Peguy says that religion begins in mysticism. But of course Peguy would also say religion does not stop there. In fact his religion has incorporated Aristotle into its theology via Thomas Aquinas. And in the 1990s the Pope incorporated Darwin's Origin of Species and Watson and Cricks discovery of DNA into Catholic theology.
They also say that religion is very nice in small doses because the toxicity lies in the dose.
And this is precisely true of metaphor.