There is nothing which rots morale more quickly and more completely than poor communication and indecisiveness - the feeling that those in authority do not know their own minds. And there is no condition which more quickly produces a sense of indecision among subordinates or more effectively hampers communication than being responsible to a superior who has too wide a span of control.
p. 43; cited in: Colin Combe (2014), Introduction to Management, p.118 - The pattern of management, 1956