It is a fallacious point, as usual.
There will ALWAYS be a dominant pick in some lane, at the moment you mentionned Kaisa but the most banned ADC is Varus... Varus is a top pick and the reason people pick Kaisa is because Varus is banned, making her easier to pick and less able to be counterpicked botlane.
Botlane is always about picking the most wanted ADC, and except if it counter a comp, it will always follow the top/high tiers.
If you nerf crit ADC, people will always pick on-hit/lane dominant/strong mid game ADC: Kaisa, Varus, Draven, Lucian & Xayah.
Nobody said Graves is broken (and it is convenient that we say what one announcer say, considering the NUMEROUS number of thing they said and people mentionning other champions being super strong, etc...), we have seen TONS of Gragas (with insane play btw), quite a bit of nocturne, we have seen some xin zhao, a lot of skarner, etc.
And yes, of course Akali shroud is powerful, it is her playmaker ability but watch the world and tell me how much Akali dominated? We have seen Lissandra as a counter, we have seen Zilean, Syndra, Orianna, Galio, Urgot, Corki...
She didn't over dominate, it is like saying "The power of Orianna ultimate" and then being like "WOW YOU SEE? ORIANNA IS REALLY BROKEN BECAUSE HE SAID IT WAS POWERFUL".
This world meta is actually the most diverse in term of possibility of composition... It isn't perfect ofc, and I am not telling you that Kaisa doesn't need tuning, but what you claim is so wrong...