you answered your own question =p Statick Shiv is a cover up for nerfing Ionic Spark because Ionic spark would proc on every hit using hurricane. Instead, with hurricane, Statick Shiv takes 4 auto attacks to proc in combat, just like ionic spark use to.
Its like when they nerfed Starks Fervor and said it was because they wanted it to be a support item built on noone instaed of an item built on master yi and shyvana.
To solve this issue as I stated a few posts ago, Ionic spark could be changed to be a melee only item.
I detest the idea of seeing so many teemos, already thinking about all these hurricanes and combinations. -_-