Pure means that when you don't use consumer groups, there is no hidden state at all, and they are just a boring data structure like everything else in Redis. On

Pure means that when you don't use consumer groups, there is no hidden state at all, and they are just a boring data structure like everything else in Redis. Only if you use the messaging part they have state, but this is an accessory part like a shell on top of what is otherwise exactly a vanilla data structure.