The rectangular shape just doesn’t make sense, the water wouldn’t have flowed as well compared to the circular PVC we use and why were they metal? It’s rigid hard to move, not particularly aesthetic and if you want to cut it it’s quite a chore.
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Because the metal crimping device they used onsite to construct the gutter made rectangular gutters, because four 90 degree bends were easier to crimp then a perfect circle. Once a downspout was made, they would slide it over a flat long board along the seam and hammer the folded join to hold it in shape, and this is also easier with a flat side.
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