How to balance Katarina and Fizz

In the past few years, Katarina has received multiple nerfs in response to QQ. I believe her damage is in an OK spot . What she does not need however is the passive from shunpo. Currently shunpo's passive let's her take 15% (maybe not this exact number but something like that) reduced damage after she uses it. If we get rid of this passive, Katarina is balanced.

Fizz also has a passive that lets him take reduced damage (but only from auto attacks). You guys always talk about how squishy these assassins are, yet they have all this survivability built into their kits. Leave the damage the way it is. They are assassins so they need the damage, but get rid of the survivability.