I've been thinking about it this way too and it's totally changed my perspective. For example I'm very skilled at drawing and find it a breeze to draw people anatomically correctly – I'm "fluent" in it while most people are not, but they are not seen as having a disorder. Meanwhile, most people speak fluently and I don't, and am seen as having a disorder.  My disability, any disability, is defined not by the person, but how society functions around them and treats them. If hypothetically humans' primary form of communication was drawing, most people would be disabled.