Kalista can use Runaan's and Rend to have Rend nearly constantly up all the time, which means it's going to be a near inescapable slow if you're anywhere near a minion wave. And her dashing on every single auto means almost no other ADC could escape or chase her successfully.
Vision is incredibly powerful, as is the ability to instantaneously make a member of your team untargetable and let them dash in any direction, which leads into a massive knockup if sent into the enemy team.
She also had no AS limit like Jhin does, and unlike Jhin, Runaan's synergizes extremely well with her.
Jhin's MS only works on his crits (aka, only his fourth shots RELIABLY until 100% crit in lategame) or if he lands a root (an extremely thin, delayed, pre-indicated skillshot). His ult is dodgeable because it's an extremely thin skillshot and immobilizes him while doing it, and if he got 3 kills in a teamfight with his ultimate, that's the enemy team's fault/the rest of Jhin's team having good coordination, because the vast majority of his damage is from % missing health, meaning, it won't do jackshit unless he uses it as a finisher in terms of damage.