If you want to know why adcs arent overpowered and its just corkie and graves and kindred that r op
Go watch voyboys stream or look at his match history. Hes fed in every game where he takes an adc into mid or top (that ive watched). He gets ganked repeatedly and set back so far he never recovers. Thats what is supposed to happen when you dont take adc bot lane (and sometimes this happens anyways). The only adcs that arent extreemly suceptable to this are corkie and graves. Graves has a dash, good waveclear and is tanky as fuck. Corkie sits a mile behind the minions and last hits with r. Plus his dash. Plus his godlike powerspike of trinityforce (anyone try iceborn on him btw?).
Kindred has higher base armor than sion and is both an early and lategame beast. Go figure.
Adc's arent broken. Its just a couple of them that are broken because of stupid ideas riot wanted to try with the reworks.