Group conversations are more coherent with a referee.

The referee doesn't have to be the primary voice, just the person everyone agrees is allowed to make calls.

When there isn't a referee in a group, the power dynamics are unsettled; as everyone feels the lack of momentum, everyone bustles for the lead role, and everything gets frenetic.

The loudest voice wins, not the one with the most legitimacy from the group.

The referee is the gardener of the discussion.

They help make sure it stays aligned with the long-term interest and goals of the group.