Who's also a top-6 rim protector in the league, who has the top steal % among centers, who is an elite screener, and whose team was 11 ppg better with him on the court last year than they were with him off despite having another center (Mitchell Robinson) who produces superior boxscore stats.
The smartest front offices have come to understand the value in micro-skills like screen setting, defensive scheme flexibility (Hartenstein can play at the nail or in drop, and can even switch a little bit), boxing out, decision-making on the short roll, cutting, etc.
For an excellent team, guys who do all of the above at an elite level -- which Hartenstein does -- are way more valuable than just adding raw points.
Look at how integral Draymond was for a decade for one of the great dynasties in league history. He was never much of a scorer!