Campbells work has been debunked by a lot of researchers, not only it cherry picks data; it pushed the lie that his little structure is universal while ignoring a lot of cultures and and traditional story structures that pay no attention to it. It is a very popular story structure in the mainstream west because it is very manipulative towards the audience. It is great for selling an unambiguous product. Frank Herbert hated Campbell to mention a modern author; The Dune novels have thematic elements that go against the hero’s journey on purpose.