While I was cutting up that tree with my axe, I realized there really is no such thing as a labor saving device. Because almost every modern labor saving device requires power (fuel) of some sort which costs money.
So in that regard they are really only labor swapping devices.
Sure I could have that tree cut up in 10 minutes with a chainsaw. But I'd have to have a full time job to pay to run the thing!
I think I'll stick with my manual options that don't cost money.