So about Katarina...
Is she going to see any changes? As a katarina main(yes I know you hate me) I was upset about the 5 nerfs in a row this season when there are far more toxic snowballing champs with broken kits(looking at fizz yasuo). Katarina has always had many counters and in any elo above gold II she is easily countered by cc. With every one having cc nowadays I don't see why she had to see so many nerfs. Her e feels like a joke now. It's main use is for ward hopping or getting to the enemy but does that really suffice? Once kat jumps in she commits 100 percent. It's much harder for her to get the reset and jump out. I think the nerfs were put in the wrong places. Her ultimate was the only part of her imo that required a nerf. Her basic q w e set required positioning and timing. But now people playing her rely mainly on her ultimate and praying no one ccs them or that the enemy team is bronze enough to not cc her.
players from the bad ones for example the passive nerfs says "Yeah you can still pentakill their team,but you cant throw a bouncing blade in (and the target dies 8 seconds later) and you get a reset."Another thing about CC it shouldn't be a problem as kat you want a team that goes in for you and when their CC is used THEN you jump. The only reason you should have problems with CC is if you're going in on the wrong time. The shunpo nerfs really affected me as well,but after a bit of practice i got used to it. Just keep practicing her you'll get the hang of things and even do some research look up guides and videos on how to play her maybe watch some pros play her :). And hey i might be wrong but i just got to plat with.