Not sure what you don't understand about playing your role perfectly on a team.

The NBA today is 100% math and metrics. Every team has a a group of analyst who know every statistic and metric of their players and they work with the coaches to design their offense around those numbers. Playing the game to maximize those metrics might add 1-3 points per 100 possessions, so they stick to the script obsessively. As I said earlier, there are like 30 players in the league who have the green light to go off script. They are the stars that have skills to transcend the others. The other 420 guys are 100% role players to run the system and support the star on their team. If they can't / won't do that, they won't get playing time or a new contract.

Sorry this is hard for you to comprehend, but Livingston was elite at what he was contracted to do and played his role to perfection. It's why he played 14 seasons in the most elite professional league in all of sports. It's why he made $50 million during his playing career. It's why he won 3 chips as a player. It's why was offered and served in the GS Front office for 3 years after his playing career ended.

If he was jacking up 3's and averaging .336% instead of playing his role, he'd had a 3-4 year seldom played career in the NBA followed by 8 years bouncing around Europe and Asia making 20% of what he made in the NBA.