I believe it has more to do with tension in ft lbs on the bridge. Santa Cruz builds a really light guitar, a OOO at under 4 lbs and the tops are tuned by removing material underneath so tension that would be acceptable for a dreadnought may indeed be too much for a small body OO or Parlor. The larger body is built to take more tension and consequently benefit from it in more volume and projection with the longer scale which also adds tension. Different bridge mounting as well I imagine to facilitate it. Don't quote me on this as it is just the way I remember it when I asked at SCGC on their tour.
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