This is what I'm referring to.

Houses mostly, the reason we need such high voltage is because someone can turn on an oven and consume 5kw. But that oven only runs for 1 hour, or more averagely, 30 minutes. So in the context of 200kwh battery systems at EVERY house, and inverters at every house, that oven can easily run off the inverter, and the house would never need to pull down heavy wattage from the grid. In this scenario, the grid's variability goes down dramatically, thus, reducing the voltage requirements... Instead every house would have small solar and a trickle feed of, lets say 800w-1kw consistently during the day.

Additionally, for places that have a shit-ton of sun, can do much better with microgrids and generators.