I think duality is overly idealized and romanticized in socionics communities. People can approach life, relationships differently than each other regardless of their type. They can have opposite individualistic qualities, they can find different things important and headed in different direction of life. Besides, in relationships, passion generally tends to decrease after years. There are other obstacles in life that affects one's general mental and emotional state. Duality can cause a person to behave and communicate in a way without needing to adapt. Duals can give each other subconcious confirmations to devalue some unvalued IEs, which could make them unadaptable in life and resent each other because of it. Saying that non-dual couples also tend to have problems due to different reasons. Long relationships require some effort and commitment from both parties regardless of ITR. Hence I don't think that duality is a magic pill that guarantees anything, so dualized people can find their partner dissatisfying, have a wandering eye, want to try something else etc. According to my observations, some people admire their dual and some people overlook, some people like them but as a friend. I personally don't want to limit my relationship with someone due to socionics if it is working in reality.