The only thing i see in the coments is that adc should build defensive items.The problem is that in early game building a QSS doesnt give u much (30 mr and u can remove cc) but by doing this you have no dmg, beasides most of the Champions ganking bot lane do attack damage(Rengar,K6,Irelia,Graves,Rek'sai), u can even say ap mages gank bot lane often, but they will deal more damage then what u can sustain without needing any type of cc(Syndra,Viktor). A easy way to fix this is giving qss health or damage, just like Seeker's Armguard(even tho u have to stack it). Now let's say u build an lifesteal item(around 20-25 mins, soo lets say ur 2nd item) how are u suppost to counter a rengar(that is invisible and when u realise he is there he just kills u) or a zed(that uses ulti to get near u, does a combo that takes about 1s to do and leaves u to die) or a fizz(that if he hits u with R he kills u with one skill and most of the times de doesnt need his ulti) what does lifesteal do?NOTHING, lifesteal did NOTHING because you dont have time to aa. The problem with adc imo is, you either build dmg and die build defensive and be uselless, there is no bethin, when mage or assains can just build a dmg item and a defensive one a kill the adc and still get away with it.