The duck is not something that is/should-be used often, and it's not to be used with a competent manager.
It's a last resource action.
It means you as a manager are unqualified to manage the project and any idea you have is perceived as a waste of time by the employees, and you make them lose time, in fact, you probably already have a track record of meaningless changes and many man-hours wasted only to satisfy your tiny ego.
Also, in that case your own opinion is as meaningless as the duck.
It's a last resource action.
It means you as a manager are unqualified to manage the project and any idea you have is perceived as a waste of time by the employees, and you make them lose time, in fact, you probably already have a track record of meaningless changes and many man-hours wasted only to satisfy your tiny ego.
Also, in that case your own opinion is as meaningless as the duck.