It's a good thing to know these skills and pass them on, so if times become so tough that we made need them. However, it's horribly inefficient and labor intensive. So you have to weigh the costs VS benefits. Could you get a job and make enough money to buy enough fuel to do the tasks VS the same amount of time spent gathering fuel, stoking fire, converting a machine, building the gasifier, and operating a machine that will be underpowered due to less energy available in smoke VS gas or diesel.
Anyhow, I do enjoy learning about these technologies, if anything, just to appreciate how well we currently have it even when it seems like hard times. Compared to my parents and grandparents living during the depression and a couple world wars, we got it darn easy still.