Whether it's scientific or not, I think it makes sense for some people. It's not based on where the moon was when you were born or something like that, and for that reason I don't oppose it too much. For ex, I'm more of an introvert than an extrovert and that is obvious to me and others. Therefore, to say that I'm an I instead of an E is just a true personal statement. Am I a thinker more than a feeler? Also yes. Again, most people who know me know this.