I don't think you understand how black cleaver works but you also can't read since you think I said bruisers since you don't understand sarcasm.
1: black cleaver takes time to stack and by the time it's fully stack the champion with it already USED EVERYTHING.
2: you don't build black cleaver and last whisper together meaning you will very rarely get two champions with those items fighting someone.
3: funny that you bring up 3 bruiser and ONLY 1 builds black cleaver.
4: funny that you also bring up champions THAT DON'T BUILD FULL DAMAGE. Like bruisers usually doesn't go full damage they build one or two defensive items and in the cases of jax and irelia almost half there build is defensive items.
5: If tanks items were bad then why are they built on many good champions?
Also fun fact about me if I added up the mastery points of the tanks I play vs the bruisers I play tanks would win. So no I'm no a bruiser main.