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Because HTML is reflowable, and we honestly don't know what your screen resolution/window/device is. One column, we're sure that we know the readers will be seeing the text (even if it might be cut). Two columns, if the device/browser window is small, the user might not see it.
It's more certain that readers will read it from a vertical orientation (top to bottom), as opposed to a combination of vertical and horizontal (left to right).
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