Rokayt wrote...
Eric Fagnan wrote...
Don't underestimate the benefits of armor reduction. On Gold/Platinum and even on Silver, the DPS of fast-firing assault rifles on armored targets can literally double (or more!) going from 0% to 90% penetration.
Such arguements I have thrown at these guys for months (Especially back when people were obsessed with the black widow, and the metagame was still "Black widow, or GTFO")
They don't learn very well 
We aren't talking about 0% to 90% though, we're talking about 65% to 90%. It's safe to say that if my gun is that weak to armour that I want the HVB on it, I'm probably already using the Piercing Mod(or going with AP Ammo, but that's a whole other story)
If you look at Piercing Mod + EB vs HVB then at 50+ damage per shot, the Piercing + EB is actually better damage output against even armour which means only the Avenger and GPR see a damage output increase. If you go Piercing + EB vs Piercing + HVB then it becomes 70+ damage per shot, which means you can add the Phaeston, and the CAR is sitting on the fence about it(Typhoon and PPR pre-charge would benefit as well), but EB would grant you damage against all defence types so it would be advisable to use that instead.
What you get is an additional mod slot out of it, but now it's coming at not only the cost of added weight, but also performance. It wont be getting considered now on both weapons that have damage values that simply overpower armour, as well as ones that aren't terribly hurt by not using Extended Mags and kits that aren't comfortable with super heavy weapons.
Compare that to the Shotgun HVB, which gives equal damage output since it has the EB built into it, and it frees up a mod slot which is a big deal for any shotgun that uses pellets due to their reliance on the Smart Choke.