When you're hungry, roast. Crank up the oven and throw in a chicken; roasting is simply the easiest and best way to concentrate and deepen flavor, to seal in succulence, and make robust, crusty, and sweet all kinds of meats, birds, fish, fruits, and vegetables. Roasting offers more flavor on its own than any other cooking technique...
When you're in a rush, roast.
When you're in doubt, roast.
When you're entertaining, roast.