It's easy to make a car with no vampire drain. It's hard (if not impossible) to make a car that has no vampire drain and also protects its batteries from degradation in hot weather. Tesla made some mistakes that led to extreme vampire drain under certain conditions, which I gather they've since fixed, and they made some choices which allow features that do have an energy cost even when the car is "off."
The opposite extreme was the Gen 1 Nissan Leaf, which in hot climates saw significant battery deterioration.
It would be nice if the car had a storage mode that would shut off everything, possibly with a warning about the lack of battery conditioning in that mode. (Though now that I will no longer be leaving my car unplugged for any period of time the issue does not affect me any more.)
The opposite extreme was the Gen 1 Nissan Leaf, which in hot climates saw significant battery deterioration.
It would be nice if the car had a storage mode that would shut off everything, possibly with a warning about the lack of battery conditioning in that mode. (Though now that I will no longer be leaving my car unplugged for any period of time the issue does not affect me any more.)