I think both. The people in charge of the art think these weird weapons were cool. And lorewise, the dragonborn lost much of their stuff to the ravages of time, including crafting techniques and whatnot. Whatever they have now, was either painstakingly preserved by tradition, or recovered from the old Arkhosian ruins.That was then. Arkhosia has long-since fallen, and the splendors of dragonborn-craft went with it.
(That or whoever was in charge of the art thought clubs would look cool.)