the human rights argument -- that we should eschew machines because they destroy life, while employing a hundred corn-pickers is in itself life -- is much more solid than claiming the machine doesn't work. It does, I've seen it, John Henry simply couldn't outpace the drill, it's a losing argument to claim he did.
A bigger humanist question is, what kind of life is it working long hard hours in a field or mine?
Being a Luddite, the enemy is the machine owner, not the machine itself.