Being an NBA superstar is a blessing and a curse. On one hand, fans worship you and your production makes you vitally important to your team's performance. On the other, you barely get any rest because your coach asks you to play so many minutes.
This common practice has varying results. Some stars are unaffected, while others sometimes suffer nagging injuries or just get tired down the stretch.
Just the same, it's hard to justify giving these types of players any less playing time. They are the superstars for a reason, and are too important to their respective teams to just be sat so they can have a rest.
Some players still simply MUST have their minutes reduced this season. Their health and production are too important in the short and long term, and they need to stay fresh so that they can maintain their current paces up through the end of the season and, in some cases, well into the playoffs.