Huh? This isn't that new of a feature, at least 20 years...probably more. And it makes absolute sense, it isn't a source of heat, it is a source of microwave radiation that travels in one direction and when that radiation contacts the food, the molecules are excited by the radiation, and heat up. Radiation is absorbed most on the side emitting the microwaves, meaning it will heat most on that side. Spin it, and all sides(except the inside) heat up at an even rate.