Although understanding intertype relations can be cool if played off a certain way, by and large it's misunderstood and misinterpreted by people who don't know you that well. You may be seen as a freak who analyzes people and compatibility.
Things go over people's heads. The longer you study socionics, the less you realize how other people don't understand.
Obsession with duality is unhealthy. Simply understanding socionics and duality won't make you closer to actually meeting a dual. You still must live in the real world.
Resorting to socionics to understand the relationships of everyone in your life isn't going to magically make them all better. It may help yes, but be wary of how much time you spend thinking about socionics versus how much time you spend actually living.