I think the main thing is to understand why oatmeal works: soluble fiber and the gut bacteria feeding on the carbs.
That can be achieved within many other diets too. I wish they were more specific in saying what's special about oats, if anything.
I also get upset when I see a ton of junk options at the grocery store. They are talking about plain cut oats and whole fresh fruit, but based on the way shelves are stocked I imagine a majority of people get the kind with all the added sugar. You might as well be eating honey smacks at that point. Yogurt has the same problem at the store.