Ed:
I'm very familiar with the Myers-Briggs Personality Inventory, the Wechsler Adult Intelligence Scale, and the Wechsler Memory Scale. I've taken all three. But my point is, if you're reading this forum, you are not likely to fit into the mold of the general population, and, I've never encountered an individual who is both INTJ and developmentally impaired. That doesn't mean that they don't exist. And when I refer to someone being developmentally impaired, I mean someone with some developmental impairment from birth arising from a specific genotype or array of alleles that caused the impairment in thinking. The INTJ personality type implies an individual who has very good abstract reasoning abilities, hence the "NT" in INTJ. Abstract reasoning is directly correlated with IQ. Take a look at the Mensa test and try to find patterns in its questions/problems - that is not easy either. I looked at the test quite some time ago and I'm not a member of Mensa. I just never had the motivation to pursue attempting to enter that organization. I think you have to be exceptionally bright to get into it. Someone on the opposite side of the spectrum of an INTJ, such as an ESFP, would more likely rely on EMOTION for making decisions, which we all know is not exactly sound reasoning. I think an ESFP would likely be swayed/lured/trapped by the suave charm of a Micro$oft salesperson simply because of their personality, would not investigate other options in detail. Incidentally, Madonna is a member of Mensa - surprised? Yeah, me too.
As a side note:
Now, a salesperson working for some large company in the sciences or engineering knows all too well, either by unfortunate experience or trained by management, that scientists can see through bullshit. They don't have time for it, and most importantly, trust is lost immediately with that representative if untruths are flaunted. A salesperson working in the sciences must really know his/her background, or else the sale is lost forever.