Does anyone even like Kalista's passive?
half of the time she doesn't even hop to where I'm wanting her to because it's a choice between standing absolutely still or attacking only one target if you want to avoid clicking wildly all over the screen. The only jump I consider very useful is the one after Q. The only time Kalista's jump is favored by those who play her is when it's grossly overpowered.
Long story short, people playing against Kalista don't like her hop because it makes her unpredictable, people playing as her don't like it because it makes her unpredictable. Kalista has plent of other iconic things about her character (piercing Q spear, infinite stacking rend, sentinels, teammate oriented) she doesn't really need the hop all over the place
every adc does a better job at kiting.
with high attackspeed, (i think it was 1.76) jumping just makes you lose time that you could kite+attack faster.