Perhaps because the loss is not great to agree upon before deciding to. If heavy conflict may not be able to work together again, and possibly jeopardize the friendship.
May lead to the loss. Since no agreement before deciding to act. If conflicting very heavy May not be able to work together. And may adversely affect the friendship.
May's loss. Because no agreed well before decide to do, if the conflict is heavy, may not participate to work again. And may adversely affect the friendship.