For thousands of years mankind has used wood for cooking and warmth. Even today thousands of people still rely on wood for their everyday cooking needs.
Firewood is an important asset – but its only an asset if the person can utilize it. In this case a storm blew down an oak tree. Instead of the tree going to waste, it was cut up for firewood.
During a long term SHTF survival situation, after the propane runs out, after the liquid fuel runs out for the camp stoves, its either going to be cooking with solar ovens, or cooking with wood, or not cooking at all.
After hurricanes Ike and Rita made landfall, I cooked for my family for between 2 – 3 weeks with firewood. For breakfast we would used a coleman stove to cook with, and for dinner we used my bar-b-que pit on a trailer.