Functions and type methods doing the same thing

[Santos]

This is incredibly trivial, but I was just curious.

For example, love.audio.play(source) and source:play() seem to do the same thing, but love.audio.setPitch isn't a thing.

Is this because play, rewind, pause etc. take no arguments other than a source, and/or because it lessens the learning curve for doing basic things, and/or am I missing something?