Akali does not need true stealth.
Seriously if you touch nothing else about the champion except making her W normal stealth, she would be fine. She does enough damage to 100-0 someone with a single item, why does she need to also remove the enemy laner's ability to come back by having the tools to tower dive them repeatedly.
It's the one ability in the game that denies counterplay. There is no counterplay. I repeat THERE IS NO COUNTERPLAY.
If this ability continues to exist in season 9, it will be solid evidence that Riot doesn't take this game seriously as a competitive e-sport.
active is valued at ~1000g, Akali has >2 (based on duration) of them built into her W, that is ~2500g worth of utility on less than a 30s cooldown.
and