You're confusing this with a lot of the garbage out there. This is based on Carl Jung's work and is absolutely valid. It's not "quantifying" personality; it's helping -you- understand yourself better. That's it.
Everyone is a combination of these things. The most introverted person in the world is sometimes extroverted, and the opposite as well. My wife is introverted around friends but extroverted at home; I'm extroverted with friends but introverted at home. You're answer "it depends" is absolutely valid and yet doesn't invalidate any part of Meyers-Briggs. You don't like to be pinned down and that's fine, but you have preferences, and that's all it's asking. You may be able to write with both left and right hands, but which one do you sometimes prefer? And if you prefer that, you might also prefer 'x'.
If you give it a chance, you might be surprised to learn something new about yourself.
Everyone is a combination of these things. The most introverted person in the world is sometimes extroverted, and the opposite as well. My wife is introverted around friends but extroverted at home; I'm extroverted with friends but introverted at home. You're answer "it depends" is absolutely valid and yet doesn't invalidate any part of Meyers-Briggs. You don't like to be pinned down and that's fine, but you have preferences, and that's all it's asking. You may be able to write with both left and right hands, but which one do you sometimes prefer? And if you prefer that, you might also prefer 'x'.
If you give it a chance, you might be surprised to learn something new about yourself.