I have seen lots of people eating at McDonalds. Doesn't mean it's good for them.
You might be surprised at what the LSI-ISTP (MBTI) and the EIE-ENFJ (MBTI) see in each other. I have a customer who is the former, and he has an employee who is the latter, and my customer just brightens up when the EIE comes into the room. I worked for a while with an EIE who is very happily married to an LSI female. Also, I dated an LSI for two years and she said her first husband was probably EIE. Unfortunately, he had an accident, got addicted to pain killers, then spent the household money on more pain killers, so that ended in divorce. But otherwise, emotionally, intellectually, culturally, professionally, they got along perfectly.
I've been keeping track of inter-type relationships for the past three or four years that I've known about Socionics, and its predictions about relationships are pretty accurate. Sometimes, you can get along great with someone who is not predicted to be a great match, and sometimes things go wrong between duals, but for the most part, I think Socionics is a pretty good predictor of outcomes.