Daily electricity is highly correlated. Consider, people rarely microwave anything at 3AM. This also means houses get wired to allow multiple loads at the same time as you might only turn on the Microwave for 5 minutes a day so that’s adding 0.083kWh to your daily total, but you don’t turn off the lights just because you want to use 1.2kW heat up some leftovers.

Further, several people in a neighborhood might all microwave something during the same commercial break. Unlike most things the grid is built for peak instantaneous demand. As such distribution needs to account for huge local demand spikes. EV’s increased demand will result in some new distribution infrastructure, but it’s mostly regional not last mile.