I just went on a date with an ESFJ. I think I get the dual thing.... somehow, it seems to mean that I end up having the conversations I want to have. It's only one date, so far, but.... even if we have different skills, we somehow have kind of the same (or overlapping) interests, almost. It was cool because I could talk about the stuff I want to talk about, and not just get stared at. And there was none of the weird antagonism/mutual mistrust of an INTP date.
The inferior functions are aspirational, so if your inferior function is someone else's strength, it makes sense why you would be attracted to that, if you can admit that you are attracted to that.
I can see how SFPS and NTJs (including INTps )are in the same quadra...they both seem to know what they want, and are inclined to go after that.
Alpha is not terribly serious, but can also be surprisingly considerate.
Anyway, initial reconnaissance is that ESFJs are awesome, in spite of much of what I've heard.