The recent Katarina buff was nothing but making League of legends a worse game. Katarina's kit has Yorick-level design and needs a full on rework before she can be viable. Her playstyle is literally "kill everyone so fast they can't react", which is straight up unfair and lacks any sort of counterplay. You don't even have the time to Zhonyas against this pile of shit.
Just please, this character has NO potential WHATSOEVER. Just gut her, put her organs inside plastic bags, and then place it back inside her body. She has absolutely no spot in this game, she doesn't even have the potential to be reworked. I realize removing her wouldn't be possible due to rather complicated reasons, but at least don't give her a spot in the meta.