Yeah, I see your line of reasoning, but so far we are nowhere near having fully automated assembly plants, especially for things that complex. A ton of human labor is required to maintain, operate and fix manufacturing lines and to keep an entire facility running. Automation is always increasing and the most ruthless capitalists of the world would love nothing more than to lay off the majority of their workers and just let their manufacturing pipeline churn out cars or whatever. We're not close to there yet.