The cardiac regulator biotic has no stacking penalty, neither does the shield extender, but the shield recharger does.

The weapon mods are suppose to have a penalty, but the damage modifer shown in fitting screen shows it working without the penalty.

Some things are reasonable with stacking penalties. Like damage mods. It would be pretty bad if someone was using two or 3 damage mods and a Sniper Rifle.

Shield Regulator penalties are slightly more realistic. When you want to add more speed to something, it takes exponentially more power to do so, thus the stacking penalty.

So I was looking at some of the modules,and it seems that the shield extenders,shield regulators,damage mods,and all of the biotics are the only mods that have stacking penalties(quite a bit actually).Would it actually help the "balance" of the game/beta if pretty much all modules had a stacking penalty?

For instance,armor reps don't have a stacking penalty,so I guess if you wanted to,you could run two complex armor reps on your low slot and rep at 10 hp/s.Is this example a possible imbalance?

Honestly,I don't know so I'm throwing it out there to get you guys' feedback.Is this one of those so called "balance" issues that CCP is totally overlooking?

Well given the fact that if some were to stack 2 complex mods it would take a full 60s to obtain 60 armor points which would add a defense of 2 bullets at the most it really isnt that big a deal.

Currently the shield extenders dont have a stacking penalty that i am aware of, ill need to check the description to see if they are supposed to have one but they certainly dont have one that works anyway. Also the dmg mods not only dont have a stacking penalty they actually have a stacking bonus when it is the same type but it is very small so it only becomes noticeable in terms of numerical value when you stack 2 complex mods and get a bonus of 21% instead of 20% with no bonus/penalty and less if there was a working penalty.

Ironically the armor plate modules 3-5% movement penalty does indeed stack and works properly.

Bonus are multiplied, not added.

Two 10% bonus are +21%, two 10% reductions are -19%.

If the stacking penalty on weapon mods worked it would be 10% for first complex, and 8.67...%(ccp uses a lot of decimals in there math) for the second. making it 1*1.1*1.0867=1.1954, probably rounded to 1.2 on screen.

Stacking penalty makes bigger difference on third module, 3 complex damage is 126.23% with penalty vs 133.1% without penalty.