Heavy Stat

So a while back I think I saw Riot mention the thought of having a heavy stat that would basically work like tenacity but on knockups/backs. I don't think it ever went anywhere because of how it would be wasted most of the time considering how few knockups there are.

So why not just give all armor items a Weight or Heavy stat making it so tanks (primary tenacity builders) start getting it just from there normal builds?

Let me know what you guys think :)