AD assassins are too strong

Compared to most ap champions, ad midlaners are too strong right now. Most of their core items give them lethality, which ignores some of the base armor the mage has. Neither the two magic pen items nor Zhonyas is a good starting items for mages, so their is no decent early game counter. Their items also give them a ridiculous amount of out of combat movement speed, so even if you outplay them in lane they can roam really easily and get kills. And we cant forget that there are two items that give them shields against ap abilities, and there are no items that give ap champions physical damage shields. AD items are too strong the way they are now. In a recent game I played (I was an ap midlaner), I was against a Zed. I was outfarming him, but as soon as he got yoummus, he killed me from full health with his ult. Getting one item should not snowball a champion that hard. In my opinion, lethality needs to get changed or a good anti-ad mage item needs to be introduced.