It is quite common for quite a few jobs to have to visit a site 200+ miles away at short notice.
As it's short notice, you are highly unlikely to be able to get a room for the night.
My diesel has often and recently got 600 miles from a tank, which enabled me to get to site, fix the issue and get home before filling up.
With destination (and most) charging being in such a state, there is no way 200 miles is sufficient. That is before you take into account that a 300 miles summer range is a 200 mile winter range.
If they make a car with a 60-80kWh battery, which can do 450-500 miles (or more), then you're onto a winner.
That will only happen by making them low drag, lower mass (reduce body weight and also minimise the battery).
If you restrict battery cars to 200 or even 300 miles, then a reasonably large chunk of drivers (those who need a diesel for range), will need an alternative to a BEV, such as hydrogen. Personally I'd be very happy with a 250-300 mile BEV and a longer range Hydrogen car.
You're correct you don't need to make it solar for new builds, but I can imagine a fair few flats in build up areas adding a wind turbine might annoy the residents
New build however if the land is big enough, you could stick wind in a corner, solar on the roof (PV or heat) and be in a much better place than today.