Assassin rework had the unfortunate effect of making ADCs OP
The 'longer burst windows' of assassins has made ADCs like Caitlyn, Twitch, Jinx, Ashe and others untouchable. It's gotten to the point where I would rather face a fed Vayne every game than face one more damn Caitlyn. Use to be able to rely on my assassins to kill them, now they cannot.
The "Longer burst windows" made it so they cannot delete ADCs, but the added utilities and DPS makes them better at dueling. Literally moving them AWAY from their intended purpose.