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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Construction sites used to have sheet metal workers similar to how they have carpenters, plumbers and electricians. These sheet metal workers would do various bits and pieces of metal sheet on the house where needed. For example joins could be covered with metal sheets to prevent the weather from entering, especially on the roof. They would also be making the gutters and downpipes for the house. They could technically make round ones but it is much harder to work with round tubes then square ones. So most of their work would be with square pieces of metal that they would bend into shape.
But changing labor cost and material cost as well as improved factory lines made pre-fabricated components that anyone could assemble much cheaper then someone custome making things on site. And if nobody needs to make custom changes to the product they can be round which gives some advantages such as easier factory manufacturing and less material for the same cross section. You did also get metal round pre-fabricated downpipes but depending on the local material cost they may not have become common before PVC became cheaper then metal.
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