Few questions

[EdwinLi]

Both most likely may fall into Blacksmithing due to Blacksmithing's nature for crafting swords and other mostly metal weapons.

Armorsmith is just as its name implies, a craft made to craft only metal armors so doubt we will see this craft ever become a craft for making DoW or DoM weapons.

Blacksmithing also already has the Lore that the crafting of Guns in Limsa Lominsa is performed and founded by Blacksmiths so majority of Guns made in Eorzea are made by Blacksmiths.