As I have explained in a thread started by Dioclecian, I hypothesize that the attractiveness in an SLI for an IEE is that the SLI does not project/force unspoken expectations on the IEE (that other types might do anyway, even against the subconscious will of the IEE), which allows the IEE to act fully from intrinsic motivation.
I would like to extend this hypothesis: The attractiveness in an IEE for the SLI is that the SLI does not have to speak out their emotional needs and wants, because the IEE will perceive them anyway and try to fulfill those needs.
I realize that both aspects are somewhat IEE-centric, and that more SLI-centric (Si/Te) aspects can also be added to clarify the nature of IEE-SLI duality.
Does this make sense?