Also an INTP, with the same experience: Including function-theory, I learned how to put into words personality traits I already knew I had, how to explore and evolve my weaker sides and also how to understand others from their point of view.
I agree that MBTI does not offer much in classifying groups of people under strict guidelines, because that is simply not what it does, but as a personal tool it can be very valuable.
It's not about who you ARE, it's about how you predominantly interact with the world.

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