We absolutely need people working in warehouses. Our society would collapse far faster without them than if all of us reading this would go away.

And that means we need to treat them with respect, and pay them properly.

I'm not disagreeing people deserve respect. But with automation do we need people in factories? Answer is no.

It probably depends a bit more on how you define “need”. Do factory owners need people in factories when a robot can do the job? Probably not. Does society need people in factories so that the individuals have a job, which creates a sense of purpose and means through which people can provide for themselves? Probably.