Why Zoe is fairly OP to other burst mages.
She does not need to be in visual range to start being effective. Thing about burst mages is that almost all of their abilities are used while more or less on the screen of their target. Zoe's combo has no need to be even close to her target to be effective. Her E and Q both can be started well out of visual range and travel a pretty long distance without much of a warning. Her E is telegraphed somewhat visually, but not 100% where it will land. Her Q is too fast to dodge normally without flash or some other movement ability when it is launched from FoW. That is why she is OP.
Sure other champions like Lux and Xerath have long ranged abilities, but all have a telegraphed "warning indicator". While not a mage, Jhin is a long ranged champion and all of his ranged abilities have a warning area indicator of some sort. Zoe does not.
Nid had this issue too when her spears scaled with distance. She could nuke a person with 0 warning. However, Nid was more balanced because for max damage she had to distance herself from her target, limiting her chances for followup damage. Zoe moves towards her target meaning if it is not a 1 shot she has a good chance to finish them off.
problem, where you need to have 
or 
, otherwise her E is too powerful for what it does. And with a 55% winrate in the latest forms of the game, #8 of the best in that category, there is no denying she has too much power in her kit to make her Q effortless.
certainly has its benefits she can use for her passive. Maybe this was not as clear as it could have been but I am in no way saying she needs a big nerf or anything, this was more for showing why she is OP as compared to other burst mages. Now, does she need a tweak or 2, maybe. But it is still week 1 of her release so lets let her play it out for a while.