Wasn't always gold, but sure rank means everything. And I otp Kat on several accounts, so I know what she can do. Even if Kat can jump to daggers before they fall, she wont get the proc damage, and shunpo auto doesn't do spectacular damage on its own. In fact, most of Kat's damage comes from her passive, which needs the daggers on the ground.
Since I know how to play as Kat and against her, I know that you can easily tell where thee daggers are gonna land and how to avoid them. Grievous wounds or not, there's still a range, and she's still stoppable. Kat's actually at her weakest when she's ulting, since she's stationary. A late game ADC can play around her, and this isn't even considering the support and extra peel. Kat is a champ that follows up on initiation late game, so if she tries to go in first, or 1v1 a prepared ADC late game, she's fucked.
Zed is like Kat. Any ADC who knows how Zed works can play around where he lands after he ults. His basic combo and duskblade is actually scarier than his ult is late game.
Eve is a scaling assassin, so she's actally scary late, but you know who else is? An ADC. Eve needs to lane E>the skillshot of Q for the extra damage>then Q>electrocute to brust an ADC, but she too can be played around, and I also don't know how she is after the nerfs and loss of frostfang, since I haven't really touched her this patch.
We weren't even talking about all these assassins anyway. I was strictly speaking for Akali, Zed, and Kat, which are assassins I play as regularly, and regularly play against as an ADC.