Biggest flaw I see with balance
Riot is obsessed about counterplay. Counterplay is a fine thing, but sometimes it shouldn't be in a kit. Take Vayne's W, Silver Bolts, there is almost no counterplay to it, but that is the point. The point of the ability is to makes sure Vayne will kill things. The old Katarina had counterplay, save CC. Instead of leaving Kat in this state. Riot had to add the silly dagger BS for "counterplay". Not all champions need counterplay. If you drafted a team with no hard CC that was close to instant, Katarina should be allowed to shred your team in under 3s