The solutions are simple, but the implementation is not. A lot of places don't have room for a water heater to store a larger amount of hotter water in order to load shift. furthermore, it's not guaranteed that electricity prices will cause any savings or provide a similar reliability of hot water.

And not every place has to do it. Most houses have plenty of room for bigger and more complex water heaters. Many of those apartment complexes that use centralized ones have room as well.

The whole thread was started on the premise that "hot water is an especially hard problem for load shifting, because people have to get hot water immediately" - while the case is the opposite - because hot water is very easy to store.