ADC's: Why you should nerf Vayne and leave the rest pretty untouched
So Riot's said this a couple of times:
"Vayne rose to prominence because we nerfed all other ADC's to be less viable while Vayne was untouched, putting her at the top."
So what Riot's been thinking is that they need to rebuff ADC's.
They don't. And I can explain precisely why.
Currently we're in the teamfight meta - the reason ADC's were nerfed was because they became so aggressively strong that they were basically 1v1'ing everyone and winning. But why suddenly, out of nowhere, would they just start roflstomping their way through entire teams? Only a few had received buffs or changes within that time frame, so what gives?
Well, let's take a look at where they were coming fresh out of with zero changes - the assassin meta, the time period where being an ADC was probably the worst thing to ever be because one wrong move and you popped like a balloon in a tack factory. ADC's had to be a bit stronger in this meta because if they weren't, they were going to be useless, which would translate to weeeeeeeeeeee assassins in every lane yeah woohoo. And good god is that just a nightmare (I've played against that team - while eventually they could be beaten, the game was so unenjoyable we just didn't).
Well, jump forward to season 5 and find the teamfight meta where all assassins suddenly receive a massive nerf - suddenly, ADC's are exploding. Why? Because they weren't touched during that time period. So all the nerfs since then have basically been fixing that rise in strength because once it started becoming about the teamplay rather than blowing up the enemy carries as quickly as possible, the power all shifted to ADC's as teams desperately build to peel for them and put all their faith and damage in them. And boy could they dish it out.
ADC's don't need buffs by and large because they're starting to function as they really should - they shouldn't be able to 1v1 their way out of situations, but with teamwork they wind up pumping out the most damage. No, Jinx should not be able to sit there with her minigun and kill a J4 point-blank who has unleashed his whole combo and has itemized correctly. No, Vayne should not be able to 1v1 literally everyone in the game and come out victorious. It's like having a catapult in Civilization - it's the only way you're going to do major damage to a city, but there's no way that the enemy shouldn't be able to destroy it if you leave it just sitting there by itself in the open.
So that's why you don't need to buff the other ADC's to match Vayne or Jinx - because they're working as intended late-game. They're high-damage but have an equal vulnerability, and that's how it's meant to be. Granted, a couple (like Miss Fortune) may need some buffs to their later game, and a couple (like Twitch) may need their laning phase tweaked up a bit to be able to even make it to their late-game ever. But other than that, all you have to do is bring Vayne down from her damn pedestal and probably take a look at Jinx as well. Stop dancing around the issue as if ADC's are shit and realize that the only reason most of them are bad is because two or three are so heavily dominant in their laning phase that it's impossible to see the others' potential since they just can't match up.
I'll stay at a safe 425 range away from any and all other ranged champs. Luckily, if they get close, I can E up to 2 of them. :'D
only damage items j4 is stupid enough to blow his whole combo to 1v1 a 5 item adc, he deserves to die. You can't expect to out DoT a full build marksman, and it's not like he's going to burst you with only 190 AD.*

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