How to nerf armor pen stacking
Make it not possible to stack armor pen. OMG ITS SO HARD!
Black Cleaver = for the team Ghostblade = selfish/AS and low armor LW = selfish/high armor, more damage
Now you actually have to pick one. How hard is it to comprehend riot?
MR shred i can see stacking because spells fall off late game (especially now with Baron buff) and usually u don't get more than your boots and a void staff or liandry's.
The problem right now isn't the individual items, its that when you combine 2 of them u cover almost any and all scenarios. In fact it equalizes itself out in returns (yeah it doesn't really diminish due to how damage is calculated unless they have 0 armor). Limit someone to 1 and they have to choose what they want for the situation.
What this does. Yi can no longer just stack armor pen and AS and lifesteal. He has to find another source of reliable damage if he chooses Ghostblade. Lucian can not just bring ghost blade for his ult, he has to choose to have the pen to kill tanks or pop squishies. Etc, etc.
or even
to a degree.
Anyone else, well they're wasting their gold and if they still manage to kill you, either they were godly fed or you just messed up that hard.