That sounds like the most backward design even of a rural area. This is not a dichotomy between cities and towns complete with pedestrian bridges and electric crosswalks, it’s also about planning that amounts past random, long-distance scattering of destinations.
I’m trying to even understand how you claim those towns become unwalkable, since that’s not due to lack of development - it’s a matter of overdevelopment of roads with wide lanes. A small grid of old buildings with dirt between them is perfectly walkable. If someone built those stores 4 miles apart from each other all in different directions, then even for car users that’s a design failure.
If you insist there is no money to develop anything in those towns or re-plan the environment, that’s an unfortunate diagnosis for the area, but that also means EVs won’t work there because of lack of charging infrastructure, and the town will die out since nothing is being maintained. Let’s keep the discussion to just places that at least have enough money to reconsider their 8-lane stroads.