League of tanks

Why are champions allowed to have a whole kit of low CC AND deal damage? Isn't the point of strategy to be risk vs reward in everything we do? That used to go for the items we buy as well before triple passive champs. Now tanks are all scaled to % health damage, allowing them to invest purely in damage mitigation while simultaneously stacking their damage. Low cooldown, high base damage and scaling, + hp %. Where's the risk?

Examples that come to mind: Braum Sion Jarvan Amumu Mundo Elise Garen Maokai Shen Tahm Kench Vi Majin Buu (Zac)