DJS-
Good points about MBTI, yet another framework that helps us understand human behaviors. I left this one out of the discussion so far, but thanks for bringing it in.
My wife is a Guardian type, (ESFJ). Many other guardian types, (ISTJ, for example), are thinking personalities, and it does happen that sensory/observant types are often thinking types, (more so than intuitive types, which are usually feeling). Intuitive thinkers, (rationals), are the rarest, at about 7% of the population. We are rare, and there is an over-representation of us on this board, (mine is INTJ). I have hypothesized this correlation has a lot to do with why we left to begin with.
d4g