Too many people do, which is why including such a question is a mistake. If you're asking already-typed people what their MBTI type is, I have no problem with that; it just doesn't belong on a typing survey.I agree there are pitfalls to mentioning MBTI alongside socionics. Just don't let it impair your judgement. I feel it is necessary because I am endlessly annoyed when people call the SLI an ISTJ. Other people disagree with me, and since people will continue to correlate between the two systems, this way we will have some data, even if it be fuzzy mistyped data.If you're mostly looking to gather data, stay out of the "type me" threads and pose surveys to people who are reasonably certain of their types. You won't help type-seekers by presenting them with hopelessly bloated surveys containing questions that may not even be relevant to the typing process.This might just be my curiosity killing me. I understand there are many things people don't want to see in a survey, however I'm not sure I really care about making a concise end product as much as I care about asking as many questions as possible.
Basically I care more about gathering data than helping you find out your type.