Oh, because I and many others have seen minimal impact on how our characters perform while dual wielding w/p, that makes me stupid and not able to understand the math?
Wow, really nice debate technique there, as usual you insult instead of prove.
And by minimal impact, I mean 1 to 2 seconds more to kill trash. Not a big deal.
The link you provided is for comparison for one character using different weapons. That does not prove 280% greater than anything else in the game. It is a flawed comparison due to it only applies to an individual build vs specific circumstances. It is not valid for the whole game, only for one build at a time.
So, it proves nothing. The results are too variable and specific at the same time.