Having developed a statement of objectives, the patient knows why he or she is writing. Because of research guided by objectives, he or she knows what to write. In the third step, the patient learns how to write it. Some people think of outlining as a straitjacket for creativity. It's really a framework for creativity.
Good writing has good bones.
Outlining creates the structure. For the best possible structure, outline before you begin actual writing. Writing isn't free. It costs effort to decide what word comes next and what sentence comes next. As you write, you invest effort to build a chain of words and sentences.