Who is reading, and what have they already tried
'Write a blog post about AI' produces a definition of AI. 'The reader has already shipped a RAG prototype and is frustrated that results come back irrelevant' produces something worth publishing. The reader's current state is the context that decides where the article starts.
Give the outline a job per section
Ask for one sentence under each heading stating the claim that section makes. An outline of headings alone hides whether the argument holds together; an outline of claims exposes it before you have written 1,400 words on a structure that does not work.
Ban the filler explicitly
'Do not write an introduction or a conclusion section.' Models add both by reflex, and both are where vague writing hides. Cutting them at the outline stage saves you deleting them later.