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Good catch...
If your Q is not merely rhetorical, then on Fangraphs' plate discipline section, you can compare to league average by clicking "Show Averages" ...
32.0 swings by Trayvon out of zone, 30.4 league average, so that's actually very disciplined for a rook...
However, he fishes at the same thing all the time. He lets high pitches go, tries to make the pitcher get the ball down, and when it's too far down he'll still bite...
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Cannot expect miracles from a kid who is in the majors 1-2 years too early...