I personally think of mbti as a very weak form of religion. The faculties are similiar, it can be a guidebook to understanding each others in a society that grows away from each other more and more.
But still the most best way to find out about others will only be through own personal experience and the study of self. If one does never start with that in puberty, but instead directly starts to live after a foreign set of perception of the world, he not only endangers himself to become a drone in thought to this religion but also that he may have choosed a framework of thought that will never really fit the person he is.
Best example for this is me, my mind goes crazy about discovering new things about me on a daily basis that presents me with ideas on what other type I could be. So I am caught in an endless loop of tought about my type, which became at a point so intense that I bored my friends so deeply with it that they thought I've lost it.
Caught in the dangerous loop of possibilities is tho not the only issue, the other one is limitation. Tho I recently was introduced to the concept of shadow functions, which does widen the theory to such an extent that it looses its charme to be mistaken as a rulebook, I nevertheless can not accept the fact for example that one function is the strongest. Then again, shadow function theory doesnt demand that, therefore I can let go of that, but then I can let go of the whole system itself, cause if it has no rules no more and no borders, I can try to come to the same solutions the systems suggests thru own experience.
I wont criticize mbti as a helpful tool for lonely souls, but it walks a dangerous line between mental sanity and insanity, like every moral or ethical guidebook