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The reason why people hate this trade is because they think it does not get the Royals close enough to convention to be worth the great prospects they gave up. They won't be close to contention because the great prospects already brought up haven't quite panned out yet.
The Royals are expecting Hosmer and Moustakes to pop up to 3 WAR levels, while the people who hate this trade are expecting them to stagnate. That is the difference between sabr contention and mediocrity, and both of them were regarded even better than Myers just 2 years ago.