Of all the head coaches in the NBA in either 2019-20 or 2020-21, there was a combined one All-Star appearance as a player, by Doc Rivers. At the league’s high point of former players as coaches, in 2001-02, there were 13 different former All-Stars walking the sidelines who had combined for 60 appearances.
Here is more from Kevin Pelton at ESPN. Is it that data analytics matter so much more? A general increase in the division of labor? Or are today’s stars so prominent, perhaps because of social media, that a team does not need recognizable coaches to bring in the fans?
The Pelton posts considers further issues in mechanism design, such as whether a single free throw should be used to determine both points late in NBA games. I would think that leads to an overinvestment in fouling from teams that are behind?