Zoe Only Feels Oppressive to Squishy Characters
Zoe's actual potential burst is pretty high but it easily caps around 2k damage, and that shrinks by a lot if you have any MR.
Zoe is able to kill mages, marksmen, supports and assassins.
Zoe is not able to (quickly) kill divers, juggernauts, wardens or vanguards.
That's why she's not a balance problem. She's good at her job. Her job is frustrating to her lane opponents. Her lane opponents are not the only members of the enemy team. So it's not really an issue. Laning phase is barely 20% of the actual game. The jungler is the real decider of each game, not the mid laner.
