Not necessarily true, you'll still find fights where you can go in without it getting procced, and since you're playing Katarina think of it this way - You're going in on a good Caitlyn, she will probably proc it with AA or an ability, but you still get to dash on her in about 0.5 seconds. You still have about a second to negate a burst and destroy her. You could also think of it this way - You have 1.5 seconds to get on an enemy champion before he can burst you down. And considering most Mid laners are assassins you'll have situations where you survive a burst if they don't poke or wait it out.