I main Sivir, then Jinx, and Sivir between her spellshield and passive(furor basically), she has her ult to reposition. She is shorter range but these tools allow it to not be a major handicap and get out of those situations by 'walking' not dashing. Jinx is not my comfort pick, because you need to be even better at postioning because of her lack of reposition until someone has died, but she is a hyper-carry with the minigun execute, massive slow. I played a game as ashe the other day, and i realized how insane her DPS was. Then I realized how often i was positioned badly when lee killed me. So playing an immobile adc means you have more damage. Unless you're vayne, then youre just a cheater. It's about being in the right place because you cant quickly move. If you take this to all adcs you will be better, but with the play style change between sivir and ashe its easier said than done for me at least