I ask, because it seems like if you wanted to make tanks good against assassins, but weak to marksmen, then it would make more sense to put it onto atk spd items.
That way marksmen and mages still die pretty easily to ability based physical damage of assassins and fighters, but tanks would have a somewhat reasonable chance against them.
venomous frost1 votesnot everyone wants attack speed even in the ADC bracket, and there's also a bruiser class
deadlychuck1 votesThis is true, but atk spd is a stat which is unique to champions who are designated as "tank killers" are expected to take. Where putting it on AD items means champions like riven, zed, jayce, exc. Who deal mostly ability based damage and as a result tend to have high burst, are hardly hurt by taking the stat when it's paired with AD.