Minus temps are indeed daunting, but not insurmountable. I have spent -40F in a snow cave with no heat whatsoever, just a good warm bag and ad equate clothing.

My one experience on Danali - minus 20F was a typical day. We had one stormy night when, with wind chill, it reached -80, all in a tent with no heat other than our breakfast stove the next morning. At the 14,00 foot advance base camp, snow caves were very much the desired choice, as well as higher.

The important thing is adequate insulation and shelter from the wind. And yest,if it is your lot to shovel snow off the tent at 2 AM, it will be an unforgettable experience.

Cold is not confined to polar regions. I have personally recorded -32F at around 4,000 feet in N. Arizona (Wupatki Nat'l Monument).
an experienced the same on the nearby San Francisco peaks.

How useful is a chain saw above timberline? Different environments require different solutions.