I like when type is listed, so I can expand my understanding of that type (like fidelia demonstrated) and perhaps improve my relationships with types that I typically clash with.
I'm indifferent about no type being listed, because nobody has an obligation to fill out any of the fields to satisfy others' curiosity.
I think the 4-letter words are LAME, because nearly everyone does it and there are other areas to show "creativity". If we're allowed to put anything we want there, I also want my "birthday" to be listed as "aardvark" and my "join date" to be "banana". Also, can my "post count" be changed to "awesome"? Very inconsistent.
I really don't like it when people (intentionally) put completely wrong types there, because then i am receiving incorrect information about types.
It is a shame that people feel boxed into their type, though I really think the most effective way to counter this is be brave, display your type, and prove the haters wrong. Otherwise how will the haters know that awesome people like you actually exist in your type category?
Types I don't know much about at all: ISTP, ISFP (only cursory), ESFP (can't think of even one).
Types I know a bit about but don't have enough first hand experience to draw consistent first-hand conclusions because of small sample size:
ISFJ, ESFJ, ENTJ
Types whose brains I haven't had a chance to adequately pick: INTJ, ENFJ, INTP
I'd find your observations interesting though.
I agree with Randomnity that no one is obliged to fill out the space for type, even if I am curious. Misinformation does bother me, although I understand some people are conducting an experiment of their own to see if others perceive them differently based on what is written there.
So, so far the main reason people do not choose to display their type is because of being challenged about it or pressured to pick one and stick with it, or else because they fear forum prejudice. What about you, Jaguar? I know that you are anti-display, but I'm not really familiar enough with your thoughts on typing (other than that you mostly disagree with Sim) to know why. I can't see your issue being either of the two reasons I listed...
Because it's much more interesting to hear other people weigh in on what type I am, than for me to simply disclose it and allow confirmation bias to flourish and infect rationale for why I say/think what I say/think.
It's like asking a question to which you already know the answer, as a means to better decipher the perceptual nature of your audience. The question is irrelevant. The answer is important.
I recently chose to present myself as an extrovert. It was at an intervju for an education program were you have to cooperate with a group of several people. In a situation like that I believe it would lower my chances of acceptance if I revealed myself as an INTJ.