I have a theory. I test as ENTj-Te a lot on socionics tests and even on dichotomy or cog funct mbti tests, but I'm an ISTP. I wonder, since INTJs and ENFPs are supposed to get along well if an ISTP which appears ENTJ might be attracted to an INFP for similar reasons, or maybe the INFP for some reason mimics the ISTP's dual type (or I forget the technical term for it) in some way.
Yes, we do mimic each others dual, we are just not quite there for full duality. But from the INFPs I know its not really a hinderance to a relationship. The differences from duality are minimal.
Here is the socionics relationship
(1)These are relations of mutual respect between partners. Super-Ego partners may think of each other as a distant and slightly mysterious ideal. They often show interest in each other's manners, behaviour and thought composition. Both partners experience a warm feeling towards each other, but for the outsider, these relations may look cold.
(2)If Super-Ego partners cannot find common interests, their interaction can become very formal. Partners normally think more about expressing their own point of view than listening to their partner. This expression comes from the confident side of one of the partners reaching the unconfident side of the other partner. The latter tries to defend themselves by projecting their confident points in return. Partners normally show interest and respect to each other if they do not know each other well enough. When partners start more close interaction, they start experiencing many problems.
(3)Super-Ego partners may think that they understand each other well. However, when it comes to day to day matters or co-operative activity, partners start thinking that their partner is deliberately trying to do everything wrong. Super-Ego partners are not interested and do not make each other aware of their intentions. Therefore their actions may look exactly opposite to what was expected. Although the hope and the feeling between partners may remain as before, it does not prevent the conflicts penetrating their relationship.
When both partners are extroverts, one of them usually feels more unsatisfied with their position. The explanation for this is that they believe that the other partner does not pay as much attention to them as they should and are too occupied with their own matters.(4) Between two introvert partners, one is always thinks about the other as being too obtrusive and clingy. In any case, friction usually begins when partners shift to a more close relationship.
So lets break it down.
Bolded (1): We are both introverts, we are both very warm, etc. in similar manners yet different. Creates a very close and comfortable relationships
Bolded (2): With introverts to really connect presence is required, due to common introversion once past that initial hill we just meld together. Trust in what the other person is good at really helps as well as just letting go as we DO try to go different directions. You have to let go of the stubbornness or problems will arise. Compromise in regard to life or problems will arise very easily and quickly.
Bolded (3): This is due to the dominant judging function going down different paths. This is where you must learn to rely on Trust...they care just as much as you do.
Bolded (4): Due to different strengths and weaknesses we can rely on each other to much in areas we CAN become competent at, just not our strong "care" spot. We can fall back into a part of our weakness that we really don't need, so its not a fully co-independence due to personality differences, but preference differences.
This is socionics relations which is similar type wise, but does have its differences
Most important recommendation...SOMEONE has to keep reaching out. Either person, and the other has to respond. Like Duals, its not hard to get past problems if you can get past a small handful of personal issues that arise within you. When both do this I can see it as a very good relationship.