What I'd like to see with percentage penetration items

Namely Black Cleaver and Last Whisper with LDR/MR is a unique passive name to the armor pen and armor reduction, giving it the same unique passive name so the passives of armor pen/shred don't stack. So as an example, let's say:

Black Cleaver Unique Passive: Lethal: upon doing physical damage, a targets armor is reduced by 5%, stacking up to 6 times.

Last Whisper/LDR/MR: Unique Passive: Lethal: ignore 35/45% or a targets bonus armor.

I know they do different things but can we make an exception here? I also realize that BC shred and LW stack in a really weird way but it still ends up being a pretty significant amount of shred.

The reason why I really want this change is because I'm tired of bruiser items being nerfed because other classes are abusing them. Whats this? The 4th item in the last year that's going to be nerfed because of ranged ADCs and Assassins? If they still want to build both, they build it at the expense of losing the armor shred from BC (make LWs passive priority) and at that point, they're paying for the CDR and rage passive in BC. Honestly, bruisers like the utility the shred can provide, but they equally like rage and the CDR. Why should their item get nerfed when ADCs don't give a crap about 2/3rd's of the items stats?

Percentage penetration is a problem right now. Lethality is a bit overtuned but that will be balanced pretty easily. I truly believe the big issue with percentage pen is that you can build BC/LW together and as for the reasons I stated above, I'd like to see that change.

Make Bruisers Great Again! Sad!