Well, in US situation might be different, but at this side of pond we have 380V 3F. 16 A onboard (what most of modern cars have) it gives like 50...65 km/h of charging speed. Like 40 mi / h
That's a lot, if you stay overnight or 8 h at office.
In my office we have heat pump (air-water) 20 kw/32A and 3 charging stations, each 11 kW/16 A. Obviously lights and coffee machine takes their share, too.
Inlet is 60 A only. We try to keep it down, as there is rather big cut for grid company to pay for "booked" or "granted" A
So in case HP is on his max and all 3 cars are plugged, 200 € worth device (not to promote anything, but made by reputable producer - ABB) restrict cars "appetite", to not to tip that 60 A fuse.
In my home I do that manually. With car's timer.
What I want to say - I doesnt see any big business to balance load. Grid companies are happy to have consumption at nights, + electricity is cheaper. So everybody wins