Roofing especially in a hot climate is harder more demanding work than a warehouse job. And it pays considerably more.
Roofing pays a premium because it is a crap entry level job that is hard to staff with reliable workers. The labor force is generally limited to younger able bodied men with transportation who are willing to do seasonal work.
Amazon can recruit almost anyone to do picking and can get value even from the people whom they purge.
Have any evidence of this or is it purely anecdotal? Many warehouses aren't air conditioned, especially Amazon ones.
https://www.businessinsider.com/amazon-warehouse-2011-9
> Amazon kept paramedics in the parking lot of the warehouse to treat employees who were fainting, suffering from dehydration, or exhaustion.
Then again, while the warehouse I worked in had much less stringent metrics than Amazon’s, there were other factors that may have made it worse overall.