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In the past the rule book strike zone was, in practice, rarely called as defined at least in the upper part of the stirke zone.
The Rule Book strike zone states “The STRIKE ZONE is that area over home plate the upper limit of which is a horizontal line at the midpoint between the top of the shoulders and the top of the uniform pants, and the lower level is a line at the hollow beneath the kneecap. The Strike Zone shall be determined from the batter’s stance as the batter is prepared to swing at a pitched ball.”
It doesn't take watching very many games to realize this is not the strike zone that is called. Each umpire has tendencies and dictates his own strike zone and how he will call a game.
With the rise of PITCHf/x and Trackman in the last few years, umpires have been increasingly monitored and judged for their accuracy and impartiality. For this reason, umpires are criticized for incorrect calls more than ever before and perhaps a trend towards enforcing the Rule Book strike zone more than in years past is occurring.
The pitchers would probably love it if they start calling the high strike per the rule book definition. However, if that results in fewer runs scored it won't take long before the rule book definition is revised to lower the top of the zone.