Have you ever seen a recipe for bean soup in the US? half pound of bacon, ham, or smoke jowl, boil the shit out of it, put 2 pounds of soaked navy beans in and boil until tender adding salt and butter to taste at the end. The good tasting recipes will have at least an inch of lard coagulating on the top when the left overs are put into the fridge. But if that didn't sound bad enough, it's usually eaten with fried potatoes and buttered corn bread. (god I'm getting hungry..lol)
as for rice, the only rice dishes I am familiar with that have any flavor are drenched with something else like General Tso's chicken or sausage of some sorts with peppers, onions, and mushrooms sauteed in butter first..
Again, poor food choices. But yes, in theory, I would agree with you. I just don't seem to think it would happen in practice often. Americans like flavor.