the major issue with the game right now is not ardent + adc
its counterpicking + lacking the gap closers or burst damage to take them out instantly.
you can thank assassin update and MYMU for that for completely removing burst from the game.
which by definition puts their sustain ahead of yours just from sheer numbers, which are overtuned yes, but would be fine in a triangle weapon situation. except their triangle weakness was eliminated.
straight up, you're losing on champion select to every adc centralized team because you lack champions who can 100-0. 
they've all seen nerfs or changes to prevent the unmitigated 100-0. when an immobile bot lane like twitch/soraka should just be prime targets for a cc jungler like amumu/sejuani or a death sentence for pushing too far up the lane to a khazix/rengar.
it is the items and champions, but its really matchmaking which is failing.
adcs still have it hehe
"Burst us down or we'll sustain through"
"You can't burst them down unless your initiate also CC locks us"
Every assassin: "By the way we also have a long delay now on our burst."
