[nicklaf]

The diagram would indeed be enormously complex, because that sentence draws upon a vast amount of existing human knowledge. You'd also have to invent a visual language for describing this knowledge, which at present probably doesn't exist. One may as well try looking at fMRI images of human brains and try to infer the way that sentence triggers existing memories in order to figure out how the brain represents hierarchies of knowledge in memory.

I mostly use diagrams for describing completely new, abstract ideas in engineering or mathematics. Once the idea is understood, then yeah, it's faster to "query the database", and simply utter a word or write down a symbol.