Actually, -10 F doesn't really impact an EV. A little less range is all. [1][2] The issues seen in some parts of Chicago last winter were specific to a set of charging stations that had issues, not EVs in general. It was cold all over, and only a couple of charging stations had issues.
One of my coworkers was in South Dakota over the frigid spell, visiting his mother. He was planning on driving home (Virginia), but SD was telling all cars to stay off the road -- it was so cold that oil wasn't warming enough and gasoline engines were siezing up on the road. Diesel was already gelled, so they weren't going anywhere for the duration.
I agree, the binary thinking is irritating. I made my decision based on having at home charing, minimal long distance driving, and fairly near population centers just in case. It is a different calculation if you can't charge at home.
[1] Not including Nissan Leaf's, the one major EV that doesn't have a temperature regulated battery. Everyone else learned from them and conditions the batteries.
[2] Percentage drop is just that, a percentage. I'll take a 20% drop from a base of 105 MPGe over a 10% drop from a 30 MPG any day.