I did notice that Bryce struck out less and walked more. I considered adding it to the original post but decided against it since I thought it was kind of missing the point--it's not necessarily a bad thing to see fewer pitches in the zone. He also has a much higher swinging strike rate, which frequently correlates with more strikeouts--his strikeout rate might rise above Trout's in time. Trout also has a much higher BABIP--.399 is nowhere near sustainable. None of this really addresses the point, though. Pitchers don't throw Harper strikes because he swings (and misses) at balls.
As for what it means about Trout's eye, if people threw Trout Harper's mix of pitches, he might well walk more than Bryce. Logically speaking, if Bryce sees a higher percentage of pitches out of the zone, swings at a higher percentage of pitches out of the zone, and misses a higher percentage of pitches out of the zone than Trout, but Trout still has a higher strikeout rate, it means that Trout swings through and/or takes a lot more balls in the zone. I'm not sure that necessarily means he doesn't have a good eye. Don't players like Dunn and Pena, two players who are well-known for their selectivity, frequently end up at or near the top of the leaderboards in terms of swinging strikes in the zone? Harper and Trout's ISOs are both very similar so it doesn't seem to be giving Trout appreciably more power, but he's been hitting a higher percentage of line drives so far this year. Line drive percent has notoriously poor year-to-year correlation, though. Again, it's hard to say one approach is necessarily better.