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I totally agree with you on that, but we also know that most of the time, OBP correlates with power, or at least some semblance of power. When a hitter, even a good one, simply has no ability to punish the ball, the pitcher is more likely to stay in the zone, which means OBP will mostly be driven by batting average. That's the Ichiro template, and of course we've seen how that's fallen off for him the last few years.
My view is that the ideal template for Safeco Field is a good contact hitter with at least moderate power. To me, the ability to make contact consistently comes before the power, which is why I would have never made the trade for Mark Trumbo. Plus, guys like Trumbo hurt you in Safeco's spacious outfield.