Didn't Rengar's rework back then just miss the whole point of it?
It took some time but right now Rengar's are just doing the exact same thing as before the rework: Jump on people and delete him within less then a second. ( ~2300 damage in 0.76 seconds last game I played) And why? Because you can Ult, Q Jump, Tiamat and Q again and the moment you land everything you just did happens right at the same time, crit and the counterplay is maximized.
Kha'Zix ablity to cast his W in midair was taken away because there was not enough time to react to it.
Meanwhile Rengar is oneshotting people in less then a second with the only hope being Zilean ulting his target while Rengar is still flying (which is a really short time to react obviously)
Sure the rework took his ability away to point-click root people (right now he doesn't need to hit his E when he is fed/lategame) and made him unable to twoshot turrets, but right now I think some adjusting is needed.
Don't know how exactly he should be changed but maybe make him unable to activate Q a second time while still flying?
I'm not in riots champion design team for a reason.
Also feel free to criticize
_As always, upvote if you agree so Riot sees our opinion_