Nevermind that Fizz and Yasuo exist, better rework Katarina!!!
When I first started playing, I was really passionate about the game and really wanted to partake in what went on. However, in the recent years, I have lost that passion due to unreasonable changes and the fact that Riot does not really value the opinions of its players.
There are many champions that were very original and amazing but have received a rework. While the rework was done to "better fit" the champion into the meta, it ruined it for the true fans of what that champion stood for. Once Riot makes a decision, they stick to it, disregarding any feedback from their players.
There are also many unbalanced champions at the moment, but Riot's excuse to that is that they're "high skill capped" champions". Examples are Yasuo and Fizz. Yasuo has, although he does require a bit of skill to play, has way too many utilities. He can walk around until he receives a shield which almost cancels out the damage from attack he receives, he has a spammable dash, low cool downs, armor penetration, easy to obtain critical damage, a wall that blocks ranged attacks, and the list goes on.
Fizz is similar to Yasuo in the sense that he has too many utilities, however, his playing style is a lot more simpler and he is more of a one trick pony. In order to compensate for the "one trick pony" style of play, Riot has made FIzz's damage output way too high and have made Fizz really hard to kill. He literally throws his ult, and even if he misses, Fizz's dash and combo is still enough to almost 1 hit champions with their magic resist items in hand. After dashing in and taking a kill, he just troll poles away as if nothing ever happened. Not so much skill here...
But all this is okay, despite all the broken mechanics, we better rework Katarina... again! Katarina is a high skill champion and she's more easy to counter than Fizz and Yasuo. But that doesn't matter, Riot isn't looking to fix broken assassins or champs, they're just looking to do as they please.
Also, I would like to congratulate Riot for destroying all of the other champions in the past, whom I have come to appreciate, such as Ashe, AP Miss Fortune, Mordekaiser, pre - rework Kat, and Shen. Your rework on them sure did increase their win rates and made a lot more people play them!... Just kidding.
seems like the safest bet.