Well, counterpoint, is it really worth putting in place all the infrastructure and planning for the relatively few days it's frosty? Maybe it's more economical to just take the hit of the days off.
You're absolutely right, but I see that the infrastructure exists - the roads in winter are regularly salted, any snowfall is cleared immediately(at least in cities), and yet the entire country is still at a standstill, because....people are worried to go out? Like, if there was a foot of snow outside and it wasn't getting cleared because it's such a rare occurance that the city never bought any equipment for it - fair enough. But I see that local councils are equiped to deal with it, but some remaining caution remains, I don't know if it's a cultural thing or just a habit, I don't know.