A very valid point, but there's also the idea of no corners for evil spirits to hide in and/or everyone being equidistant from a central point if the stand around the edge and it's a round one rather than an eliptical one :-)
We have to assume that the builders knew how to make a rectangle, because the could make accurate trapezoids and circles, horse-shoe-shapes and ovals, so why not right angles?
I'm not sure why you decided to call your post pedantic?
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