they tried to fix it too but it didn't really do anything
graves/corki/ez all day erry day
The problem is that unlike all other ad carries, Graves Corki and Ez don't really have any glaring weaknesses. MF and Cait fall off compared to other carries after lane phase, Sivir and Twitch have shit range, Kog and Vayne have shit lane phases, Kog, Sivir, and Varus have no escapes, Trist has to go curl up in a ball in the corner if she wants to survive midgame, Ashe is more of a utility carry than a melt-the-entire-enemy-team carry, Draven is ridiculously hard to deal maximum theoretical damage with while still positioning well, Urgot isn't an AD carry...
Ez, Graves, and Corki are strong in all 3 phases of the game, all have good mobility, all have good poke and strong burst, and are even less squishy than other carries to boot (granted, Ez and Corki have to build an early triforce to achieve this, but triforce is amazing on both of them). It's not even something that buffs or nerfs can do much to - it's really more of a kit and concept-related thing. Unless every single AD Carry get's a rework in the future, or we get some sort of huge meta shift, I think those 3 are going to stay relevant for quite a while.
i'm done rambling about champs that i don't play now