Right. He doesn't swing at total junk, he swings at pitcher's pitches.
He had success with that in the minors so he continued doing it. Other players don't have the bat to ball skills and have had to refine their personal strike zone at an earlier point in their career.
The fact that he doesn't just hack at everything is what makes me think a further refinement is possible once he learns what he can and can't drive when facing ML pitching.