It’s because the game is played more efficiently. Also the rate that Luka is ahead of his time is nowhere close to increase in play.
Teams are willing for star players to have higher usage rates and shot selections that doesn't frown upon taking 10+ threes routinely. Also, there are far more "good shooters" in the modern NBA than previous generations combined with teams upping their three point attempts to historical levels means far more spacing for individual iso scorers to operate compared to previous generations.
