Good commander adapts to conditions, doesn't ask for everything to be in a sunny meadow in May.
Sure you can hunker down in a blizzard, you can also use it as cover to attack - especially against people who only shelter.
I do like the ideas about it acting like WP, and nerfing deep snow affecting retreats.
And it is very weird that only one unit in one faction can buy immunity, having one unit in each faction have it, especially an underused or poorly scaling one would be interesting:
Soviets: conscripts (of course)
Usf: rear echelon (they got to pick from the cold weather gear rather than send it forward)
Ost: pios, grens or pgrens
