This is only really needed if everyone drives 200 miles every day. The average commuting distance is something like 35 miles IIRC? That means a 1-2 hours top-up every day, easily manageable for the whole neighbourhood, where it is likely to have been provisioned for at least 3kW load (mid-match kettle) from every house.
Today's OLEV grant approved chargers all will automatically load-balance the EV charging against home electrical uses. They also all must be "smart" perhaps for the same reasons you've stated.
Totally! Hydrogen has its places for much larger applications, where size constraint won't hamper its efficiency.
It's just, passenger cars doesn't really make sense to feed the already low efficiently produced green-hydrogen into very the tiny low efficient hydrogen fuel-cell. It simply doesn't make sense to turn 1kWh of energy that could have powered a very capable and convenient car 4 miles, into a less capable and not as convenient car that can only drive 2 miles.
We, as a species, has already wasted enough energy........
Guess you are on mobile? it's in the nameplate. I drive the family Skoda Octavia when wife wants to drive her Nissan Leaf. Otherwise I drive the Leaf. Octy is for long distance or boot size required. Leaf covers the other 80+% of our daily uses.
The second hand Leaf was very cheap to buy, no more expensive than a Yaris hybrid or similar aged Golf. But since 2017, where demand for EV have picked up, EV prices, even for used, is higher than comparable fossil cars.
However, one has to remember the vastly cheaper running cost of EV's. You can effectively spend 2/3 of your fossil fuel cost on EV's, wasn't this the reason many people man-maths justified for diesel? Many people lease or PCP their car, so this means prices are actually comparable between a £200pm Golf vs a £250 pm ID3.