I think this highlights a weakness of Arc -- while terseness is probably wonderful once one has Arc in one's brain, it makes things considerably less legible to everyone else. Contrast with presenting CL/Scheme to proponents of the other, where I would assume they could mostly muddle through, Googling one or two odd things. Have you ever tried Googling "arc no function"? (Lisp analogy may not be accurate; substitute Python/Ruby or C#/Java if it makes you feel better.)