Jumps?

I get that having a z-axis is hard and that for all functionality a jump is just a dash that looks different and can ignore some terrain, but personally it doesn't make sense to me as a Zac that I can't jump over Jinx e's to get to her. Or trying to Trist jump to engage on someone over a Volibear and he knocks me out of the air. Is there something that can be done about this?