Using wildfires for slash and burn agriculture would allow you to clear a vast swathe of land pretty quickly, thus making it suitable for cultivating plants.
Starting a fire in the wilderness is hard; much harder than starting one in your fireplace at home. It becomes worse, when you’re dealing with wet weather.
Our environment continues to change, so you can expect more massive fires in areas where they may not have happened before. That’s why you need to be ready.