You understand that the BDR that they give us isn't even correct right? If you want to take a looks at a useful part of the weapon looks at the damage die, the crit multiplier, the damage, and the crit range. Because if you think the game needs BDR to perform anything, than you are mistaken. It needs those things I already listed, and while those are the things involved in BDR it makes BDR not necessary. Especially since it isn't even correct and especially not as a data point. BDR isn't even correct, and you think it is necessary for the game? Ridiculous. You want accuracy and proper data, look at those numbers without bdr, and also factor in every other source of damage.
BDR is not necessary to perform calculations. The factors involved in it are, which in fact make up BDR. But it isn't like BDR scales up as you get damage. Therefore BDR has no significant use as a data point. The formula for calculating damage is of course useful. But that isn't what BDR is. BDR is a number that attempts to use the factors to determine how useful a weapon is. And it does that, but it is a meaningless value. You don't need BDR to calculate any damage. You can simply look at the factors on the weapon.