I never felt comfortable in my own skin until I felt I had an explanation for why I was so unusual.
That was definitely a plus for me! Once I figured out that I was an INTP and saw how uncommon the personality type was, especially for a woman, it was one of those "ahhh, I get it now" moments. No wonder I had such a rough time growing up, and no wonder that all the ways I tried to make myself conform to the stereotypical "ideal female" were complete failures.
At least it made me feel better about myself, although sometimes a description was so accurate that I got a bit emotional over it. Just reading about how we can so often be outcasts . . . yeah. That brings up a lot of rough memories.
In some ways, it's been fun and informative. This kind of analysis appeals to me, and it's really interesting to consider what other people's types are. I don't expect to be super accurate about it all the time, but it's interesting just to know about it and look for clues in the person's behavior. That can help me relate to them better. Knowing that concrete thinkers make up a high percentage of the world's population is definitely useful. And explains a lot.
But sometimes it simply confirms what I already know. My ex-husband tested ISTJ (but lately I'm thinking he's probably somewhere between that and an ISTP). He's a great guy and an awesome father, but we just were never on the same wavelength. Well, I could have figured that out based on our types, but it's not like I needed that to tell me.
Same for my husband, an INFJ. We have this intense romance and serious compatibility. So when I found out that rationals tend to be really compatible with idealists, and specifically INTPs with INFJs, it certainly made sense but again . . . hardly news to me. On the other hand, it has been useful for us both to see where some of the pitfalls are, like when I'm trying to work through some logical solution to a problem of his and all he really needs is a hug.
I guess maybe it's safe to say that we don't need personality typing to understand someone, and because everyone is an individual, you DO need to look beyond it. But I do appreciate its relative simplicity as a jumping off point. Especially given the number of people out there who have trouble with the concept that everyone else doesn't - and shouldn't have to - think the way they do. If a simple system gives them some greater insight, hey, I'd say that's at least a step in the right direction.