Check out this article by Dave Francis at Foundation Age Coaching: 5 Benefits to Rotating Positions with the Foundation Ages (June 7, 2018).
The debate as to whether rotating positions for players at youth level is one that will continue to develop for a long time. There are those who believe that players should be pigeon-holed, for a variety of reasons. Then there are those who believe that position rotation will benefit their long term individual and collective development. I am of the latter.