I also disagree with this statement. I played PnP long before I played any cRPG and my first encounter with the concept of AC was from AD&D. And I never thought decreasing AC made much sense.
Then again, I think AC the way it works in either D&D edition is stupid anyways. But that is beside the point.
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No, that's the point exactly. AC is *stupid*. It makes no sense at all, and attempting to explain it logically is far more difficult than it is whether it should be counted up or down. Why start at 10 anyway? That's silly too, isn't it? I mean, a high AC is good (in 3e), right? So why does my character get a full 10 points to begin with?
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Why did German physicist Gabriel Daniel Fahrenheit create a scale where water freezes at 32