the video is in french. But to TL;DR:
He says that during the Dark Age having 2 guns was a necessary to increase the chance to hit but now with guns with lot of bullets there is no point in using 2 guns.
He can’t seems to see that the more guns you have, the more fun you have 😜 .
Unironically, I’ve practiced akimbo and it’s not terribly effective but… It’s not ineffective at getting rounds down range and near target.
Just like full auto you really can just course correct and put down an oppressive amount of fire semi-accurately. Especially sub 30 yards.