While some authors write specifically to make an argument to an audience, many others write because they want to follow their personal Muses. Sometimes writing is a catharsis, or an exploration of self. Sometimes authoring is a sharing of experiences, fragmented images, or just of a point of view.
Sometimes authoring is marking a path for an audience to follow, or perhaps just presenting emotional resources the audience can construct into its own vision. Interactive communications question the validity of a linear story itself, and justifiably so.
There are many ways to communicate, and each has just as much value as the next depending upon how one wishes to affect one’s audience.