Most copywriting advice gives you two steps. Understand the customer, then write. Maguire runs three, and the middle one is the framework.
The blueprint answers three questions before a sentence gets written. Which messages go on the page. What order they go in. What the offer is. That is a content decision, not a writing one. Separating the two stops the page becoming a list of everything true about the product.
The order does not come from her taste. It comes out of the research, and she is specific about the mechanics. Surveys, customer interviews, review mining, competitor reviews. She tags each finding as a motivation, an anxiety or a pain point, drops them into a pivot table, and reads the counts. At 150 or so insights the ranking is obvious, and the ranking is the hierarchy.
Hierarchy, content and language all come from the same pass. The language part matters as much as the order, because the words come back out of the research rather than out of the writer. Then the copywriting phase begins, and she goes back to the research a second time to pull the customer quotes she writes from.