Just consider what your 'needs' are, with respect to the person (not the type). I've seen very healthy Mirror, Activity, and even Identical couples. Duality just seems to be another kind of relation along the same lines, not necessarily an ideal one. The extent to which any relation is "ideal" is going to be far more dependent on non-Socionics factors IME.
For instance, I don't find myself romantically attracted to most of my duals per say. It's easy to see how the Socionics part of it works out fine—communication-wise and what not. But there can be many other aspects out of sync which make it hard to be 'into' them. Which seems to be a common experience for many people, and it makes sense. Why expect to have perfect attraction to an entire ~1/16th of the human race?
Just means conflict either induced or exacerbated by differences in IE-values. These differences are kind of a Big Deal and can/will be a source of consistent misunderstanding between two persons. Since IEs are like innate cognitive filters through which minds parse sense of experience, one's perspective is immutably bound by them—i.e., a
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will never see things in the same shades that a
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does, or vice versa. At best, one can gain awareness of each other's differences, and learn to emulate a synthetic understanding of it. This can be useful in bettering communication and making life easier, but it's never the same as natural, direct, firsthand perspective. It would always be an approximation of
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only, understood abstractly via
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.