From hamburgers to healthcare, machines can be created to successfully perform such tasks with no need or less need for humans, and at lower costs than humans.
Deep Learning Is Going to Teach Us All the Lesson of Our Lives: Jobs Are for Machines
Scott Santens

Similarly, plowing fields can be more successfully performed at a lower cost by using horses and oxen. And yet that astounding technological progress results in far more human benefit.

The problem you seem to be concerned with is the rapid accretion of the rewards of these efficiency gains into the hands of a few. Rightly so! But that argument can be made capitalistically, without need for technological scaremongering.

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