Kha, Rengar, Akali cannot exist
Assassins that are basically point and click and can delete a squishy target with no mechanical requirement is not okay.
Riot even said that they didn't like Rengar mechanically being so simple and being able to delete squishy targets, like ADCs/Mages, and we all know how difficult Akali is to balance. Given that she's all point and click and you either have CC or mobility for her or you die. Even then you're not guaranteed to be able to get away because she has her 3 ult dashes. Kha is another example of an assassin that has point and click abilities on top of his mechanic of being able to dole out damage before he even completes his leap.
These champs can't be reworked with minor adjustments. Assassins need to require more mechanical skill so they're actually rewarding. I'd much rather see a Zed making plays than an Akali just smashing her keyboard and killing someone just because her mouse is hovering over her target (same with Rengar).
Why isn't Riot willing to do full reworks on these champions and fundamentally change their kit?
. But I'm not telling rito to remove them. Being salty on the boards won't get riot to just remove one of their champions. Maybe propose an actual constructive rework idea.