Appliance manufacturers receive money for meeting standards proposed by people in the Department of Energy who care nothing about results and testing organizations that test dishwashers with plates and other flat items on the lower rack and cups, glasses and bowls on the upper rack which does not give any advantage to dishwashers with a separate wash arm or effective sprayer for the top rack if pans or other concave shaped items are loaded into the lower rack blocking water to the top rack. Of course, stupid people who scald dishware before loading pieces in the dishwasher won't notice any of this so nobody calls the testing bodies on any of this. As long as the manufacturers engineer their products to meet government standards, they are amply rewarded and until the government does not do anything about efficiency, nothing changes. Look how many decades domestic washer manufacturers, with a couple of exceptions, kept serving up machines with mediocre water extraction compared with machines from other nations where resources have always been higher priced.