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.206/.289/.338/.627 was the batting line for AL pinch hitters last season. Managers almost always pinch hit into platoon advantage. Sometimes they don't, and sometimes the other managers switch pitchers, but that stat probably represents something like an 80% platoon advantage, maybe higher. And yes, the LOOGY might come on and walk the only batter he sees, and sometimes a pitcher walks the 3rd batter he sees, and sometimes they walk the 10th batter our the 20th batter. Throwing strikes has little to do with a batter. Almost any batter would say it is more difficult to pinch hit or DH.