Tank/Bruiser balance suggestion
Currently in my opinion the line between Tank in Bruiser is nonexistent because of how much Damage can still output versus bruisers, take for example Darius and poppy, their damage output is pretty respectable and they can be both played as pretty good tanks. My suggestion to differentiate the two would be adding %dmg reduction on tank items, this would sacrifice damage for increase tank stats. True bruisers would continue to build damage/health, however they would not provide the same effectiveness versus ad/ap carries as a true tank.