Set Effect For Tank Items?

First of all, I don't play tanks, I'm actually really happy that armor is supposedly getting nerfed. Like, I play Talon, and occasionally Zed and Riven, there is no better news for me than "armor is getting nerfed". However, I do feel like the entire concept of armor is somewhat broken--one frozen heart adds like 20% physical dmg reduction, 5 frozen hearts adds like 40%. That's kinda stupid. It's almost as though riot is encouraging people to play League of Bruisers with this concept. What's the point of going full tank if the tankier you get, the less gold efficient your stat becomes? Well, there is very little point, really, and tanks are either worthless compared to bruisers, or overcompensated, as was the case with Cinderhulk and all. So I say make tank stats scale better, but nerf its initial effectiveness. Make it ramp up instead of fall off. And that can be achieved in the form of "Set Effect". For those of you who haven't played any RPG ever, allow me to elaborate. So, in RPGs, there are item sets, and if you equip a certain number of items from the same set, like helmet, boots, and armor, you get bonus stats in addition to the stats each piece of the equipment can offer on its own. And if we nerfed the standalone stat of each armor item, but gave them 4, 5, and 6 piece bonuses, that would, first of all, make tanks scale better while not really allowing bruisers to abuse tanky items, as we would put the most worthwhile stats in the end. Kind of like Dragon buffs, really. Also, this encourages building different tanky items that are unpopular in the current meta, providing more build variety, strategic diversity, all that good stuff. That's what we want, right? Just my two cents though. Flame and downvote all you want, just something from someone who used to play RPG....