Audience is incredibly important for all styles of writing. It is important geographically, linguistically, historically and socially. All of this needs to be in mind so that way your message can be communicated as effectively as possible.
For instance, the piece I’m writing while in Ireland is written for an audience back home in the States, so I have to go into that knowing most people do not know about The Troubles or even the current existing religious and political conflict. Whereas if I were writing for a Northern Irish audience, I could write less about the background and more about the happening.