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@aufbruch
I’ve lost track of who said it with all these vague assertions, but I’d like to address the idea that curved seat-tubes are not as strong as straight tubes. Like most things frame related, this really depends on the builder. When you bend a tube in this way, the material on one side of the tube is stretched and the material on the other side is compressed. On the stretched side, the wall thins out slightly. Consequently, curved seat tubes need thicker walls (and preferably less pronounced butting) than straight tubes. If your curved tube came from Reynolds/Columbus, it would have been shaped before it was shipped out to the frame builder with this in mind and there’s absolutely no reason for it to be weaker. If the framebuilder shaped it themselves then I agree this would be a concern.