Exactly. Think about how hard in life it would actually be to dual weild long swords or warhammers. It would be very ineffective. Maybe daggers would work, but I think that they wouldn't utilize dual wielding.
Dual wielding blades ain t that dificult as long not passing the one handed of course.
Dual wielding blade and blunt if feasible but clumbersome, since blunt rely on weight they require much strenght and equilibrium and kill your agility.
Dual wielding blunt is clumbersome and a invitation to be butchered by a quick blade.
The problem is how to handle dual wield ingame.
Dual wield were most used in a parry/attack, defense/disarm, double defense against heavy weapon and double attack agaisnt non shielded/light armored foes.
How to build this in control without being cumbersome "gameplaying" speaking is DA problem.
I m not agaisnt it, but i find its not that essential, its just a cool side feature.