I've been trying out maxing W second on Zoe with Hexflash, and it's damn fun.
The movement speed is really that good. There is a huge difference between "30% for 2 seconds" and "70% for 4 seconds".
Yeah your frag potential is a lot lower with your lessened burst, but in teamfights your overall damage shouldn't suffer too much, since you only need to get two W procs for its damage increase from rank 1-5 (180) to surpass E's damage increase (320).
This makes me feel like a trickster. I'm not sure if it's objectively better than maxing E, but this feels like how Zoe is meant to be.