Dual wielding mainly has use in blocking and deflecting incoming weapon attacks. The swords we have now in game are not so good for that. Shorter blades and axes work best for it.
Dual wielding never seemed like a RL thing, but it looks cool, so why not.
"The psychological trials of dwellers in the last times will be equal to the physical trials of the martyrs. In order to face these trials we must be living in a different world."