Am I the only one confused by this rule?
No, I'm not confused about the definition of it. I'm confused as to why the batter is automatically out. The rule was instituted as a safeguard for the at-bat team. It was to prevent the fielding team from purposely allowing the ball to drop to then turn it into an easy double play. OK. That's a great rule. Except the part where the batter is out. Why does baseball reward the fielding team, regardless of the outcome? If they allowed the ball to drop on purpose in order to fool the team at-bat, then it's an ethical issue, and they should be punished by allowing the batter to reach base as well as other baserunners advancing one base. If they committed an error, then they should be punished by allowing the batter to reach base, and the baserunners advancing one base. Why is it once this rule is invoked, the fielding team is free to screw up?
They say the purpose of the rule is to protect the team at-bat. It prevents easy double plays. But that's about it. Errors are rare, but they are a part of baseball. Fielding teams shouldn't be exempt from their mistakes just because of the trajectory of a fly ball.