It is letting pitchers throw pitches that are on the edge of what they can control. Also, when pitchers throw balls the same way they have for years, changing t

It is letting pitchers throw pitches that are on the edge of what they can control. Also, when pitchers throw balls the same way they have for years, changing the way balls move in ways the pitchers haven't been able to account for. The result is that the number of batters hit by pitches has gone up, and some of them have gotten seriously hurt (orbital bone fractures, broken noses, etc).