Insulation in mountainous and cold environments is vitally important for a few reasons. The most obvious of those is that you need to stay warm in order to stay alive. Your options are being naked under a blanket with people you don’t like (maybe just in that situation) or being normal, humane, and sane human beings. The second reason is that it keeps your energy bill down. You spend less in energy and resources when your house keeps the warm stuff warm and the cold stuff cold. There is another component that our benefactor values and that is air sealing. He is just grand at finding leaks and sealing them off so that air (a somewhat ok conductor of heat) cannot travel in and out of your home.
All of that so that I can say just look at those gorgeous homes in the video. Just look at them! They’re gorgeous!!