A-frame or even 45degree angle roofs are very rare.
The other benefit of an A-frame is that the snow drifts deeply enough that winter-only cabins don't need as much insulation, because there's a 4m drift on all sides except the front.
Those kinds of places are also where you find "doors to nowhere" on the 2nd floor, because that's the winter access. One door at ground level for summer, one door ~1.5-2m up for winter.
I love visiting, but I'll never live there!
Helsinki, for example, only gets a total of ~90cm a year. So the mountain sees more snow in a single event some years than Helsinki all year.
Upwards of 80cm in finnish lapland, so quite a bit of snow, but not the ~2-3 meters common in the high sierras and cascades. This is mostly because the elevation is low and the sea exposure is smaller (wind blows from the pacific over the mountain and dumps snow). The Paradise Snowtel on Rainier, for example, routinely has 3-6 meters / 10-20 feet of snow in winter, and is one of the snowiest places on earth. The only place I'm aware of that has more is Aomori Prefecture in Japan and they have similar geography.