The world has gone the way of specialization. Successful teams have specialists for specific functions. Look at the NFL in the last few years. Forty years ago players played both offense and defense. Today we have nickel backs, designated pass rushing linemen, run stopping linemen, third down running backs, etc.
Most successful teams have specialized players.
Creating and managing this menagerie is the key. The most important key to management is to hire the right people. Make sure your staff has the characteristics and qualities you desire before hiring them. If you expect a strong work ethic from your staff, then you better hire someone who has one. You can t teach, train, or coach your staff into having a strong work ethic.