This is excellent. Very accurate, imo. You can love adore and respect each other, but I don't think either dual really understands the other deep, deep down...and that helps keep it interesting.
I think dual relationships, if both people are healthy and invested in having a successful relationship, are great not only for enjoyment, but for honing communication skills, effective argument skills (note: I mean fair arguing to seek out truth, not fighting), and respect for oneself as well as the other person.
The differences bt the two contribute a lot to the respect factor: your dual can effortlessly do things and think in ways you struggle with or miss entirely, and in the course of interacting and especially when arguing w them, you realize this even more, but you also realize that the same is true from their perspective -- there is a lot of mutual respect (admiration, even), and that is a big factor in dual relations that I don't recall reading or hearing much about.