Prewriting and drafting are early. They lead up to the first complete draft, the point where the writer has all the raw material down and is ready to work on it. Revising, editing, and proofreading are later stages. During these stages the writing is clarified and made ready to leave the writer's hands and go out on its own. Prewriting, broadly speaking, is whatever the writer does before writing the first draft.
Writers working in the prewriting stage can exhibit many forms of behavior.
None of these activities could be called either good or bad ways to proceed. What works for one writer might not work for another. What works for a writer one time might not work for the same writer another time. When writers pay too little attention to prewriting, they plunge into the first draft before it is adequately planned. With luck they will get through the draft and it will be pretty good.