Kayle is sitting high and might on her 55% winrate and no one is even batting an eye, clearly what it takes is some person to pick her in LCS for people to wake the hell up.
Meanwhile, no one is playing or banning her. Though i´m sure those have no correlation with her winrate. Kappa.
The problem is that Caitlyn is finding success while being played a lot and not being banned often. Champions like Lee Sin suffer from first timers and unexperienced players, hence the relatively low winrate while having high pickrate.
Caitlyn just needs a nerf, period. Either to enforce her supposedly weak but not anymore mid game into an actual weak mid game, or just outright gut SOMETHING from her kit.
Or Runaan's can just go back to simply being a non-crit AS item, with a lot less AS, though. 70% nowadays and very single ranged AA based champion will be throwing parties.
Y'know why people don´t pick Kayle in the LCS? Because up there, beyond the high elos, she's just an immobile ult bot at every single point of the game. In solo queue, she shines, because teams aren´t as coordinated, mistakes aren´t punished as hard or as often and games extend to the point she can actually out damage everyone. Plus, between playing Kayle for the 10 minute farm or playing Darius for the cheese level 1 kills, or Riven/Yasuo for the flashy and often failed plays, who do you think people will prefer?
Certainly not the lovable angel.