Well it seems rather rude to assume you know better then anyone else here, but hey whatever you say pal. I suppose you could be like an expert or something, but that is besides the point.
I think you are maybe looking at this all wrong, people come to forums to find a sense of community that they may lack in real life. Add the charm of being able to keep this place separate from your real life if they so choose and you have a place that seems safe.
It's not all about making sure you have the right type, or even a type. There are a few people who either don't know or don't bother to divulge what type they think they are. People are not looking for something to quote on research papers or whatever, they are simply looking for someone to relate to. Someone to talk to, vent to, people to advise them, encourage them. A place to just chill and be, talk about random things even, and hopefully find like minded people along the way.
As people we all look to be understood on some level I think, and if its not a forum about types where they find this, then it's on a forum about being a single mom, a recovering drug addict, an armature writer... No one really really gives a damn, except for a few people like you I suppose.
Not to say that types aren't important or that other labels aren't fitting for some, simply that this isn't the right place to try and get it 100% right.. It's a place to have FUN with a theory, not to stress it. Its a place for eventual self discovery, for everyone, and pointing out that many people don't know themselves is rather redundant.
lol wow, I sure did ramble a whole lot. right well have I suppose you have your reasons for being concerned that other people on here can't make informed choices. I worry about random things too sometimes, so who am I to say anything.
have a good one man.