After explaining to people the unscientific nature of type-based personality tests like Myers-Briggs, DISC, and Enneagram, the common responses I get back are this: The author James Clear rightly said that "The more sacred an idea is to us—that is, the more deeply it is tied to our identity—the more strongly we will defend it against criticism." If you've made these tests an aspect of your identity, or anything for that matter, you'll do anything you can to confirm your bias and validate your position.
That's what we do as people for anything we believe in. Without question, people do get some value out of type-based personality tests.
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