When doing different basketball drills you want to be able to maximize the amount of skill development that you get out of them. Ideally, you want every player that is involved in the drill to be getting better. With the the Reggie Miller shooting drill you have 3 players involved, and every player is going to be working on a specific skill. You will have a passer, a shooter, and a rebounder, and all of them are going to be working on a different skill during the drill.
This is also a great basketball drill that you can do with your team, because it moves quickly and keeps a lot of players involved and getting better at the same time. The primary player in this drill is the shooter, and they are going to be able to work on different cuts, footwork, and making shots when they are tired. All are key for development as a shooter.