Since I'm one who doesn't care much about corner OF defense, my position on this is probably in the minority.
IIRC the Twins OF defense was the worst in the league by a lot of metrics. Even if you don't buy into those, it should be obvious more range in the outfield is the difference not just between outs and hits but also singles and extra base hits. With. a team that has the worst strikeout rate in the league, you need good defense everywhere, not just up the middle.
Not sure if you watched Boston in their series but the number of balls these OF we're able to cut off and get to was notable.
i also think that Hammer's defense is a big reason he has so little value, both by metrics and the fact that he's still here, even with that 2012 season.
Just something worth considering.