I am reminded of the social experiment long ago in which rats were placed in a box. When the critical "one too many" rat goes into the box, the society in the box crashes - Some rats viciously attack others and fights break out, some go to sleep in avoidance, some groom themselves until they are bald, some die in stress, and some begin vomiting and other actions. One too many sets of hands brings one too many agendas, ingredients and ideas to the production and the end product is ruined. Before that threshold was reached, the task was easy. It reminds me of a painting we did in junior high - everyone in class added their own contribution and the picture became one large brown-gray thing like a badly-mixed wall paint.