The biggest complaint in the mostly opinion links you posted regards people who are borderline members of one category or another. But in the categories where p

The biggest complaint in the mostly opinion links you posted regards people who are borderline members of one category or another. But in the categories where people are solidly one way or the other, the derivative information about how they prefer to communicate and operate is very helpful in group situations. If a group attends a working session on its internal communication with an MBTI expert (so, everyone's already taken the tests and shared their types), the magic that ensues in terms of improved communications is striking. I've seen it done.