They should call it “backend workers” instead. Backend “subscribers” (think ”workers” please) don't use PUB/SUB because then the same message will be delivered

They should call it “backend workers” instead. Backend “subscribers” (think ”workers” please) don't use PUB/SUB because then the same message will be delivered to every worker. You hardly want that behavior to process web requests. PUSH sockets only deliver the same message to one PULL socket.