It's not about that, there is no point in having a horizontal top tube, it increases weight and decreases stiffness of the frame. As far as I can see, the only reason horizontal top tubes ever existed was because of industry standard lugs back in the day, and following from that, traditional aesthetics.
I'm not a frame builder though, someone please verify/dismiss my ramblings.
It's not about that, there is no point in having a horizontal top tube, it increases weight and decreases stiffness of the frame. As far as I can see, the only reason horizontal top tubes ever existed was because of industry standard lugs back in the day, and following from that, traditional aesthetics.
I'm not a frame builder though, someone please verify/dismiss my ramblings.