Pretty much. The Statcast system that made spin rate data widely available was introduced in 2015. It took a couple of years after that for the realizations tha

Pretty much. The Statcast system that made spin rate data widely available was introduced in 2015. It took a couple of years after that for the realizations that higher spin rate = lower batting average and that sticky stuff is the easiest way to increase spin rate to percolate throughout the league.