The Sixers make a move for a third option signed for the next several years to play with Embiid and Maxey. They pick up their backup PG and a ball handler off the bench that can keep the offense running with Maxey off the floor.
PG - Maxey / Jones SG - Melton / Beverley SF - Oubre / RoCo PF - Kuzma / Batum C - Embiid / Reed
Some might look at that like it's not a massive upgrade over Harris. However, you are getting a legitimate number 3 option that has been a number 3 on a championship squad. You are getting a guy that is more aggressive, and a much more willing shooter. He's known for being clutch. And the best part is the decreasing contract.
With the FA market limited in talent and so many teams trying to compete right now, good contracts are valuable. Kyle Kuzma's contract can allow them to go get a max player if they wanted. Otherwise they can stack some role players around them.