Well you are the first proponent of the MBTI I've encountered who has disagreed with those two statements. We clearly have very different experiences.
When I took the MBTI in secondary school, it was stressed that the specific point was to discover which of the 16 types you were, and that knowing which type you were would be helpful in life.
That is sad. Maybe criminally negligent, for the school. I slotted, initially, neatly into "architect", but I saw all the other slots as other ways to be, and to explore being.
As ("even") Heinlein said, specialization is for insects.
When I took the MBTI in secondary school, it was stressed that the specific point was to discover which of the 16 types you were, and that knowing which type you were would be helpful in life.