My brother is an ESFJ and he doesn't care at about types etc at all like most sensors I know. I think it has to do with what they found are of more value. Knowing about self and how we connect to other things is something Ni wants. For people with Se, being out there an experiencing things is much more enjoyable. For without Ni, types will be nothing more than mere labels. They can't see any practical purpose to it... and thus show no interest.