This reads like a cyberpunk dystopia novel. The robots are allowed to move freely about the warehouse while the human employees are restricted to limited workspaces and unable to converse with one another on organizing their labor. Possible case study that would imply Amazon is expanding operations at the same time each warehouse is becoming more disconnected from their other human counterparts, likely on purpose, with the intention of preventing workplace unions from being formed.
Imagine a single warehouse with 1,000 employees interacting with one another to discuss wages and work conditions. Now imagine 10 warehouses each with 100 human workers and 900 robots working to achieve 10x+ the output. In one of those scenarios, employees could unionize to affect their relationship with their employer by withholding labor. In the other, they will not. I believe this is on purpose and it’s hard to argue it’s not.