Not sure which areas you're referring to but in the Northeast EV infrastructure around the metro areas is not the best. In my experience, I would have to plan out my stops if I was driving between Philly and NYC if I didn't have a 90+% charge and even then I would be worried that there would be a line or chargers would be out of order.
Taking a look at an EV map, there's only half a dozen stations around NYC with 100+ kW chargers and almost all of those chargers are in-use at 2 pm on a Saturday. Sure you can go to a slower charger or just wait, but it's a pain in the ass if you are trying to plan out a trip and show up on time.
That seems low. Even looking only at Tesla Superchargers, there are something like a dozen just right around NYC itself. Not including EA or any other providers.
Heck, even sleeping Portland, Oregon has 10 Tesla Superchargers in the metro area.
Never heard of a Tesla going home with 12% battery.
Depends on the EV. My Tesla can chew on a lot of battery with Sentry mode. My Lightning, on the other hand, goes into deep sleep and loses essentially zero energy while parked. It can sit for months without a meaningful loss of charge.