The DH. Part of a set of rules changes in baseball, following the 1968 season, in which offensive output sank. By replacing the pitcher with a designated pinch hitter in the batting order, it replaces a poor hitter (the pitcher) with someone who is, at worst, mediocre. Not implemented until the early 70s, and only in the American League. Purists have complained for 30 years, for the DH takes some strategy out of the game. The players' union likes it: having one more everyday player creates jobs.