Riot.. why are you beating around the bush nerfing everything except what is actually OP?

Tanks and the mastery Bone Plating are absolutely fucking absurd. Why do they skip any and all nerfs every single patch? This game might as well be called 4 Tanks and an egotistical ADC because that's what the best team comp is and has been for almost a year now. Why do ADCs and Tanks get away with this every single patch for going on 2 years now?!?

EDIT: Bone plating is so fucking OP that it is taken on mid laners and even ADCs sometimes... if this isn't the most OP mastery in the game idk what is.