You know what would really help Katarina in this meta? A QoL change for Shunpo.
Not sure if everyone is experiencing this, but Shunpo cancels everything following its use.
Seeing as Katarina is whose someone that demands quick reflexes and reaction, its disappointing to face one of those cock blocking moments when you Q-E and expecting to R your way to a good fight, and then suddenly everything stops dead in the track, even your movement.
Her animation screws her over. And leaves player feeling dazed and confused with what just happened.
Aside from that, her W could use a ratio buff for its horrifically low base. Unless she snowballs, that skill is useless on its own.
There's also one thing she could use, clearer particles to indicate the actual range of her abilities. I get that her blade models don't have much going for her, but it would be nice to have a clear view of her blades, her W and R particles are small as heck and its hard to see if it hits.