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You're acting like .260/.320/.400 and .260/.320/.360 are the same. They're not. They're about 50 runs different over the course of a full season for a team. That's not a minor difference. And yes...if the Astros in 1965 had hit for a 100 OPS+ they'd have scored about 50 runs fewer than the Mariners pitchers gave up in 2010.