I'm a bit skeptical, on average people generally use similar appliances at similar time, ain't noboody using that water heater in middle of the day where they are at their job.

There are certainly some savings to be had but I don't see it being that much unless some kind of battery is involved.

Maybe the future model is a small substation with battery for the whole community using some cheap-at-scale battery tech to store local community's solar and wind.

Then some net-billing system where you pay market price of electricity only if you use more than you store, with any profit from that going towards maintenance