Is there any reason at all to pick Akali over Diana anymore?
Things Diana has over Akali: -A better laning phase -An infinitely better mid game -A better late game -Making picks -Higher burst -Splitpushing -Teamfighting -Survivability -Better waveclear -Good initiator
Things Akali has over Diana: -Sustain -????
Before Akali was better than Diana at splitpushing and making picks. After her rework she doesn't have jack over her. Her passive no longer working on turrets means she can no longer splitpush and the complete gutting of her ultimate and overall burst means she's no longer better at making picks than Diana unless obscenely ahead. Diana has her double tap R to kill her opponents before they can get away and has her E to pull them back. Akali has one medium damage rotation and then has to wait another 4 years for it to come back up.
Before, both of them had very comparable burst mid and late game which made Akali much better at making picks, but now that Akali's burst has been reduced to almost nothing there's no reason you would want Akali on your team for making picks when you can just have Diana do it 10 times better instead. Akali's shroud is still, for the most part, useless in teamfights because it always ends up in a bad position because she can't choose where she wants to place it and is still very vulnerable to AoE just like before. Not to mention the bug that allows some abilities to reveal her that shouldn't be able to which makes it that much weaker. Diana, on the other hand, has no problem surviving because she has her big shield and can build tankier without sacrificing much damage while Akali can't. Her E on top of all of that to CC her opponents and mess them up makes her even better at teamfighting.
Before it was kinda a meme how Diana was just "Akali 2.0", but now it isn't even a contest whose more reliable of a champion. Diana is basically Akali 5.0 by this point. If the point of the Assassin update was to make the Assassins more unique, then how is Akali unique when compared to Diana? The only thing she really has in her kit that Diana doesn't is her shroud, but Riot ruined it with the update so that doesn't really count as much anymore.

