Why don’t we want manual labourers?
Because they are weaker and less efficient than machines.
If I had the choice and can afford to choose between a person picking fruit and a machine picking fruit, I will pick the machine.
A human will get sick. A machine won’t.
A human needs breaks and insurance and have to be paid. Machines don’t.
If a human is broken, a life is affected. If a machine breaks down, it can be repaired and sent to the fields to work again.
Also, I can depreciate a machine as a deduction. When a human ‘depreciates’ for someone to profit from that, it is a crime against our own species.
I am a god in my farm because I own it. I don’t know any farmer who would pick unreliable, easily breakable, under paid(if they have a conscience, it should bother them) human worker over reliable machines because the prime directive of a business is to stay viable and profitable. The farmer wants to make a profit and hopefully in an ethical and sustainable manner.
Human workers for repetitive manual unskilled jobs is not sustainable.