Zed needs a leash range to jump back to his shadows
Just like Azir has to be in a certain range to command his soldiers to attack, Zed should be within a certain range to jump back.
This ability to jump back over vast distances without a condition while being manaless is ridicules. If you look at Yas, he needs minions to do it and he doesn't have an easy time going back to his tower in lane because he can't jump to his minions.
Kalista takes actual skill and practice to master her mobility and she is paying a lot for it as the only ADC with reduced damage on her AA.
Zed has pretty much no condition for the huge distances he covers while going back.
,
, and
to have to run in with their gap closers if they want to kill someone with no escape other than flash?
ult allows him to be put out of the fight for nearly 2 seconds while also being put right next to his target with an easy escape. And for the cc part you need to understand that cc shuts down every champion, including
and zed can nope out of a bad engagement,
and take advantage of the huge bonus movespeed from his ult to completely invalidate whatever counterplay the exclamation point gave him.