Why put quotation marks around "data-driven" and "streamlined"? They are data-driven. People who do their jobs well get recognition, and the guys who show up and put in a half-assed day are asked to leave.
The jobs are designed to be doable with 5 minutes of training by anyone off the street. But they offer 40-hour weeks at above-average wages for untrained labour, with set expectations that can be met. Many sites offer after-work classes for in-demand skills to help people get better jobs. They have medical staff on-site in case of injuries, water stations everywhere to help keep people hydrated, safety rules and regulations they follow very carefully.
Most warehouse jobs do not offer those things.
>there's a line of people around the block waiting to take your job the moment you slip up.
Recruiting is typically handled by outside firms, at most sites I saw. They don't want to fire people, because hiring people costs money. Even if initial training takes 5 minutes, it takes a week or more to get good at the job, which means every time they fire someone, they lose money on labour efficiency while a new person gets up to speed.
I have some criticisms of the company after my time working there- including some that, as you said, gave me trouble sleeping at night. None are related to the way warehouse associates are treated.