When it comes to superstars in the NBA, each one of them has a large workload for their team. They must be a step ahead of everyone else, both offensively and defensively, as this is more than just a task assigned to them; it is a responsibility.
However, at a certain point later in their career, coaches eventually realize that if there is a way to alleviate pressure, they must do so immediately. This can extend their time in the league, as injuries are unpredictable but less likely to occur with less time on the floor.
Furthermore, head coach Tyronn Lue, along with the offseason focus of Lawrence Frank, made it clear that James Harden would have a smaller workload next season.