I think you have presented an important component of 21st century grids –minigrids. Minigrids are the way things are evolving where there are remote locations where central power is not easy and has not come.  They start with some solar panels and even old fashioned batteries with modern solid state devices that use low current DC like cell phones and LEDs. Low current and low voltage with 12V or 24V which the whole automotive/RV world operates on.
We have DC minigrids now that are in things like sever stations that operate at 380 VDC.  A lot of saving not doing AC to DC conversions both in terms of electrical efficiency and heat n the case of server stations. We need good home wiring and grid standards to allow these efficiencies to be added.
There are multiple forms of storage both at the home level and the larger minigrid level.