Experience can replace the speculation.
Communication becomes ... isolated/filtered in most situations. You can have a socionically favorable relationship as your boss at work, it's not always guaranteed to go well or you will get to know them due to restrictions of hierarchy and professionalism required which can constrain. For example I have an IEE manager, I get on well with him, infact we agree on a lot of things and share similar insights, but he frustrates me with his lack of organisation, a "P" trait. In other settings we would be great friends, although as it is we get on well but it is a business set up and after work we live our separate lives. On line presents different scenarios, where people who would not normally open up to each other can and do get to know each other quite well, so there are different aspects to all forms of getting to know someone. Even people who know each other very well IRL, they still say if you want to know me come and live with me, for instance.
As for communication with duals and quadras in general, when I think about the best relationships I've had, they've been people in my quadra. There is an EII I know IRL but not too well, i've been somewhat put off by her because she has tattoos and cusses. As much as Deltas can have tattoos it's not quite my thing, but i've since learned in a passing remark by her that she wishes she did not have her tattoos, it's a mistake, also I am theorizing the cussing might be that she is trying to support her SLI friend who cusses a lot, but we'll see.
I think i've been asked to comment on this, possibly, but I think Maritsa is EII, because she represents what I understand to be Fi and Ne, I don't want to battle type as none of this can be proven and in the end all parties don't gain.
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Rebelondeck, Also in your article, I don't find mirror relationships the least complementary. I know SLIs who do little but I understand it because I can sense their Si, even although I oppose lazyness generally. For SLE I see them spending a lot of time on (to me) fruitless conversations and making noise for the sake of noise, which I find more of an irritant because it doesn't resonate with my productivity or my brand of sensing.
This isn't to say SLE is wrong, please don't misunderstand me, and any Beta type or other type please don't think so either, what it does mean from my own experiences as myself and my type, that same quadra is easier and opposing quadra the most challenging, but it's safe to say that other circumstances can affect relationships, it's enough to leave it at that which would always be common sense in my humble take.