I was indicating towards those who though being NPs are not at all suited to such analysis. I know of one INFP who would be useless at such things as the whole process of making a decision about someone would send him into mild panic!They can be. I said most "naturally" adept or something, meaning on average of course.
I'd estimate that the analysis of people does sit well with NPs but perhaps not necessarily solely based upon this. It also requires some level of ability with analysis and also learning to work, in part as a J. Without definition and assumption then all progress is halted.
(Call that nitpicking if you like... it's true... it is.... )