Sorry, but I find your logic kind of funny. What about before the invention of power? Chickens have been around for a VERY long time. In the grand scheme of things electricity has only been around for a little while. They survived that long without it just fine, and can keep doing so.
Okay yes this is true, and depending on your local environment, folks kept certain breeds known to handle whatever cold gets dished out.
So when my parents were kids, no electricity until the early 50s, so what,. lived without, don't bother with heaters now, have the water pail frozen every morning, cover the house plants too.
I live where it is friggin 1 of the coldest parts of Southern Canada, infact it is -35 right now, with a -47 windchill, wouldn't this be fun to have only the woodstove going in the old uninsulated clapboard house on the prairie.
Currently I have mostly bantams, and have some heat going in my coop, just enough to take the edge off, and where water takes at least to overnight to freeze a bit. My little birds are less stressed and more comfortable as a result. Yesterday I saw several wild chickens (Sharp Tailed Grouse) near my property, they can handle it, but they are very much adapted to this climate for probably a 1000 years.
Hoko coko, feeds his more corn, others do other things.
I will put it nicely this way, 0f or even to -10f is mighty cold, but -30 to -50, is a whole other story, why would I make my bantams sit ina coop at say -15f, when they can have 20-25f........nuff said
IMHO, people should do as they feel is right, without feeling coerced by those who do not agree with there methods, well above 0f needs no heat, but subzero needs some at times