You're correct and plenty of us share your opinion. However, some RR users want to have the tarp fully cover the suspension triangles of the RR so that the doors can be completely closed with just the CL, strap, or whoopie exiting the tarp. 13' tarp is required for this if the RR is hung at the usual suspension angles.
I've always used a stock 11' Cloudburst with the RR when I do use that hammock (full disclosure, that's not often). The width of that tarp, plus plenty of overhang at each end of the hammock has always kept me dry. Some might want the doors at the ends, and might want them fully closed, if limiting exposure to wind is a concern for them.
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