Both articles seem to tackle the problem merely from the perspective of middleclass suburbans who want a "cozy" fireplace. An open fireplace is more of a decoration than a effective way of warming your house. Warming spaces with wood still a very viable alternative and can be cheaper than electricity if you have proper a stove in your house and a reliable and cheap source of wood.

It's not a viable solution in a city but definitely among the better ways to stay warm if you live on the countryside.