Cait kinda bullies out most adc's, idk how kalista's laning phase is. But the problem is her passive from my perspective.
Think the biggest problem with kalista is the fact certain champions (or team comps in some extreme cases) have nothing they can do vs. her.
For example I love playing Olaf, Nocturne, and Shyvana (even J4, she can just auto until she is outside your ult like WTF) but when I see a kalista on the other team no way am i going to pick either of those champs. Kalista easily kites champions that have no gap closer (or if you have a gap closer your only choice is to burst her down, and if u can't she will just hop away), which makes life hell for people who play less mobile champs since you can't do anything vs. her. Landing skill shots on her is quite hard on her.
If there was an item in game that allowed my Olaf, Shyvana, Nasus, & Nocturne to actually fight her it wouldn't be too hard but an adc you can't lock down is fucking scary. Or if she had a limited time like tristana's rapid fire where she gets her hops, then at least certain champions have some kind of opening against her, but atm certain champions have no way of fighting kalista. (Have you seen top lane kalista, holy shit it's the most broken thing ever vs. melee worse than teemo since she actually scales into an monster)
I'm an Top lane/jungle main and I love bruisers who kinda get wrecked by kalista unless you one shot her so yea i might be biased but from my perspective the champion is broken since I have so limited options vs her since she kites and hops away forever.