I don't get this. I could easily transcribe anything I could write in a day into a diagrammatic representation. Hell, I could do it for anything I could write given a large enough whiteboard. It might consist of complicated flow diagrams or fragments of mathematics, but it would convey the salient points. This seems like fanatical code worship, "code is the only appropriate representation for all analytic thought". Nonsense. Maths, state diagrams, uml, even prose are useful and in combination adequate languages.