Based on some experiences in rural Mexico, I think folks in the rich world underestimate how daunting power tools are to many people in the poor world. The majority of craftspeople I met and worked a touch with were extremely reluctant to try to use a circular saw, etc. These are folks that can use a machete with the precision of a surgeon. If you didn't grow up around powered equipment, it's a significant hurdle to get over, even when there are tremendous benefits.