I found myself strongly agreeing with him about fill() specifically. Fill what? It's a verb that performs no action, and is really shorthand for setFillColor,

I found myself strongly agreeing with him about fill() specifically. Fill what? It's a verb that performs no action, and is really shorthand for setFillColor, which sets invisible global state. It's not at all obvious from the name what fill() actually does, nor what it's parameters are. Only through previous familiarity with graphics APIs and RGB triplets can I infer the meaning, and in a learning environment it's silly to expect that familiarity.