User blog comment:Aphostropils/Questions from a beginner/@comment-3003548-20160415105153

As has been pointed out, AD increases AAs as well as AD caster's skills, so unless champs were designed with that item in mind, it would create at least some problems. However, it's not like there couldn't be a workaround, like having an item simply specify it only affects skills and not AAs, whether by pseudo AD or some % increase in damage or whatever. While champs might have to be tuned a bit around a new type of item like that, I don't personally think it would break things when you already have items like Black Cleaver. Whether it's actually healthy for the meta (pushing it in a good direction, allowing strategic diversity and fairness etc. instead of becoming the new required item), I don't know.