Maces and morningstars come from 2 common civilian families: large stick and farm implement.
A dedicated military item like an axe can look and act very different from a civilian one in balance, hitting power, endurance.... The difference with swords is what has been pointed above: swords can ONLY be used to kill people while other weapons have secondary uses. Or their cousins have. Oh, and swords tend to be more expensive. Or at least were more expensive when first introduced since they required all that straight metal. Not a real argument anymore given our tech base, but at the time it was quite important and turned swords into status symbols of the warrior and the rich.
ranting now. In any case, a vibrokatana or wakisashi looks great for a universe like BT. This is how they will appear in my universe if I ever use one for combat. In a wedding you carry your 300 year old weapon. In your cockpit it is a high tech item that can help you exit the cockpit even if the hatch is jammed.