Now just to derail a bit more:
There is one almost universal point that eliminated dual wielding in almost all cases and that is:
If your weapon is made properly it will allow you to grab it with both hands even if it is designed for use in one hand. This will with almost all weapons allow you to wield it with much greater speed agility and strength, out competing someone wielding two weapons.
But I acknowledge that most people didn’t train with two weapons but with one and stuff was really expensive in the past. It’s to note that cheap weapons that rely on mostly force such as maces, clubs and axes greatly profit from the 2h tactic as it is exactly force that you won’t gain from dual wielding.
Try breaking something with two hammers than with one and both hands.