In baseball, hitting .400 is near impossible in today’s day and age. It has not been done since 1943, 81+ years ago. However, it was fairly common before that period. What is the NBA equivalent feat of having a percentage this efficient that it’s near impossible to accomplish in today’s day and age? But it was doable back in the day?
The equivalent statistic isn’t going to be a shooting percentage, because basketball players have become more efficient with time.
I agree with the 20+ RPG suggestion. It was something elite rebounders could achieve back when the pace was higher and guys were missing more shots, but it’s essentially impossible in the modern era.