I live in cold Switzerland and a family in my house with 3 little children has one of them. The car is always parked outside. They seem really happy with it and this was never mentioned as an issue.
"Cold" Switzerland? Hasn't been the case in years. Bielersee used to freeze over dozens of metres for weeks, it hasn't happened for at least five years if not height.
In terms of places that are even colder then Switzerland not many people live. And you can't just compare the Bielersee, there are these things called mountains where people go up to ski and it does get quite cold.
i've lived in cold places where i've worried about breaking the handle off trying to get into my car. usually in the early spring when the warm sun can melt snow, but it has time to freeze as well.
The doors are an interesting example since they always seemed strictly worse than the traditional design, unlike the rest of the car.