Give Zed and Fiora the "Kassadin Treatment"

We all know the monster Kassadin used to be, but after consecutive balance and small reworks he became one of the most balanced champions today. It's hilarious too, because now Kassadin has a reason to be picked, a niche he fills, he's not picked anymore because he shits damage, well late game he does but still.

Zed and Fiora are picked because they shit damage and one can build bruiser without loss. Both are very safe and oppressive. I think they should be balanced over the course of a few patches instead of gutting them completely in one patch, just like kassadin. This will allow the community to communicate with the state of these champons and see if the need more changes.