why are people acting like zed jungle shouldn't be a thing?
It used to be really strong back when elder lizard and the item you get before completing it heal'd you for the damage dealt in the jungle. It made him sustain very well.
His only weakness in the jungle was sustain, as he has ganking potential, farming potential with both AoE and single target, so really all he was missing was sustain.
I used to play it a lot during season 3-4 and I believe it was even played once or twice in a pro match in korea or something (forget, I just remember someone mentioning it to me and asking if that's why I was doing it).