A dual can have a "tempering" effect on you. Duals tend to allow each other to tone down their ego functions a bit, thus rendering each other less obnoxious. You know the sort of thing... an LSE who will often be in overdrive until they're in the presence of an EII and they'll calm it down a bit, an ILI like the Underground Man from Dostoevsky's Notes from Underground becoming less neurotically cynical about everything when an SEE pulls him out of his existential anguish, etc. Essentially, they allow you to see beyond your own realm in a way that isn't threatening.