I think there exists a common misconception, that NFJs understand people best. I think it's really NFPs who are the real readers of people, only are less prone to be such a show offs about it. Fe+Ni works based on so many generalizations and subjective expectations, that the individual concept loses the real potential.
Deep into that darkness peering, long I stood there, wondering, fearing, doubting, dreaming dreams no mortal ever dared to dream before. E. A. Poe