The author's point is that for some projects wireframing may not be appropriate. I've had this experience on numerous occasions where let's say a full-color design comp or an interactive prototype would better serve the concept, which may be hard to grasp otherwise.
This is especially true when taking a design first approach, or when your project gains nothing by illustrating hierarchies, navigation, or other wireframe-able things.
This is especially true when taking a design first approach, or when your project gains nothing by illustrating hierarchies, navigation, or other wireframe-able things.