On my team we're all managers. We manage ourselves and our output, and we manage our team, team's output and each other by supporting and assisting each other.

On my team we're all managers. We manage ourselves and our output, and we manage our team, team's output and each other by supporting and assisting each other. So from that standpoint I agree. I don't see the need for dedicated managers though I do value our dedicated scrum/agile coach though, who encourages all of that.