I would agree that you wouldn’t want to use personality typing as a means to tell you who you are, but I think they can be useful, in at least some cases, as a means to say “if you feel that this describes you well then here are a few pitfalls you might want to look out for.”
Like Blue Print Random the type 5 seems to describe me quite well. For the most part it’s only telling me things I already knew about myself, but I find the ‘unhealthy’ end of the personality type very interesting because it points out negative aspects that this personality may be prone to and I believe that can help me notice when I dip into the unhealthy realm so I can be better able to avoid those pitfalls.
The test itself makes things easy, but probably isn’t always terribly accurate for everyone. One thing a person could do is forgo the test, read about all types and decide for themselves which, if any, type best fits them, then read about it to gain some insight especially on the negative side so people can catch themselves and hopefully prevent themselves from falling into bad habits.
For instance some types are prone to falling into manipulative or otherwise hurtful behavior, but finding reasons to justify this behavior so they don’t feel guilty. If you know that about yourself then in the process of looking for a reason to justify you might realize what you’re doing and decide there really is no justification and instead forgo the hurtful behavior.
I think that most people don’t want to be mean or hurtful and just don’t realize when they’re doing hurtful things, a personality type I think is one tool that can help people notice when they’re dipping into negative territory so they can better avoid that behavior. No one is perfect, we all make mistakes, but armed with the right knowledge we can strengthen our ability to be the good person we really want to be.
P.S. The type 3 does seem to describe my girlfriend pretty well too, she was a dance major in college. I think she, like most, tends to stay in the average to healthy realms most of the time, but like anyone else we all have our good days and bad days.