I agree with you, but in Hobart's defense,
back then lots of families had their house hot water heater set to 180(so everyone could get a hot shower in the morning, mostly); so by the time the water filled for the main wash cycle and the parts and dishes were all warmed up, heating the water wasn't that critical. When the energy crisis occurred and people were first advised to lower the water thermostat to 140, I remember people being appalled.
Around that time I did a semester abroad in Europe and learned that all dishwashers and washers had internal heaters because energy prices there were enormous compared to the US. That was when I first met and fell in love with my first Miele(up to that point I had thought that Maytag was the state of the art).I had a British friend whose mother had one of those old Wallace and Grommit water heaters in her house that you had to operate with coins!