Can someone please tell me why Evelynn was nerfed into the ground then reworked, if there is this?!!

www.youtube.com/watch?v=um3wPe_WV9U

Why is this still in the game after evelynn's oneshotty stealth playstyle was removed? granted, rengar has 10x more power than old evelynn did. It would take evelynn at least two rotations with a lich bane to kill someone that squishy. and rengar runs in and oneshots anything.

basically removing eve from the game and giving her identity to rengar.