The idea that people don't really use their "shadow" functions is just a convenient excuse for the discrepancies between real people and the MBTI. What makes it so convenient is that any time someone reports unusual function use, all you have to do is insist they're wrong, and they'll be powerless to prove otherwise. I notice this is a common tactic with orthodox (instead of liberal) MBTI users: they'll provide increasingly irrefutable explanations. In this case, we have someone who says that it's literally impossible for someone to know how they use their functions, unless they happen to know which type is theirs. But how could someone know which type is theirs, if we accept Simulated's idea? According to his reasoning, any time you think you're using one function, it could just as easily be some other function in disguise.