Shaco dives turrets if he knows he can kill.
i.e. Viktor can generally be burst down instantly under turret by Shaco
But my main point was: that style of playing has almost the same counterplay.
To be honest, Rengar has a hard time against basic league mechanics. Wards, grouping, positions, GA late game, etc.
He has to be very careful to dive in and kill, and almost like Zed now, he can suicide himself to kill the carry at late game and either run away to base because of CC and hp, or die trying to kill/after the kill. If Rengar manages to kill someone and get away scot free, there was something wrong that your team or you was/were doing.
Rengar is rewarding to players who know positioning very well and punishes those who don't. You learn this, and you effectively increase your chances of surviving against Rengar, tenfold.