Pitcher evaluation and decisions are often more about what a specific organization can tweak to a certain player than raw statistics. That is where the current game is heading.
For example, the Boston Red Sox had the lowest combined four-seam fastball and sinker usage in baseball. They took Tanner Houck, eliminated his four-seam fastball, and had him throwing sweepers 41% of the time. It worked.
Teams like the Atlanta Braves have been elite with four-seam and slider pitchers. Think Spencer Strider, Chris Sale’s resurgence, and Reynaldo López. A team like the Yankees have made their mark with cross-fire sinker-sweeper arms.