Training a mage to use their staff as a melee weapon to defend themselves added to my immersion. Leaving mages with just their spells and not learn to use the staff in physical combat just seemed silly to me in Origins and in Awakening. Even D&D mages can use daggers and slings to defend themselves. Mages generally don't, which only leaves them with their staves.
Indeed, it makes little sense for a mage to not utilize one of the best martial weapons available right within their hands. Bo staff. Or even like DA2, when they has blades on them, like spears and tridents, or glaives, to utilize like polearm weaponry. If I were a mage, I certainly would be outfitting my staff to be as lethal as possible not just in magic capacity but in melee combat as well. If an enemy gets through the ranks to be in your face, and you have no defenses or offenses, you're easy dead meat.
I like to reference the Sacred Ashes CGI trailer from Origins. Morrigan not only uses her staff expertly in melee combat but she also does combination takedown maneuvers (leg and staff and grab) with it as well.
Edited to add: Dorian's concept art looks more like a spear or trident polearm to me.