You know how the joke goes...
"Why would you play an AD Carry besides Graves?"
"So you can give your forehead a break!"
hahahahahhaaha this is absolutely brilliant.
Botlane, especially in competitive play, is literally an absolute cesspool AD carry-wise. It's only going to get worse, too.
The (Korean) heavy pushing meta punishes the lategame-oriented carries because as we saw in TSM vs LGN, Vayne's turrets were all taken before she could actually do anything notable because the rest of her lanes lost hard and this prevented her from farming really at all. She and Kog'Maw have no place in "take all outer and inner turrets by 20min" comps. They should never even come CLOSE to hitting their lategame farm and build against comps like this unless the push comp plays horribly wrong.
Miss Fortune and Caitlyn, traditionally strong earlygame carries, are now outclassed by Graves and Corki. Literally, why play either when gravves and plane boy.
It was nice to see Cait actually
get picked and have a 100% winrate. And holy balls I nearly cried when Vayne finally made her appearance and we were blessed enough to be graced with Kog'Maw in the final game.
Side note but IMO Curse royally screwed up their support pick that game - they wanted a strong AOE comp but picking Sona into Blitzcrank is literally the most retarded thing you can ever do - he bends Sona over and bones her rectum so hard he pulls her lower intestine out because she can do absolutely nothing to help her carry if he is getting zoned or if either gets grabbed. Leona would have been an infinitely better pick and her ultimate, though the stun radius is smaller, is still an AOE mega-cc and would increase the damage of Zyra's ult. Kog could literally not farm in lane because of Blitz and Sona couldn't help him.
Ashe was surprisingly absent and Sivir was notably MIA as well, which I think is odd because Sivir is wonderful in splitpush comps and is the best ADC at pushing because of her spells. However, why pick 500 range Sivir when Graves/Corki mash buttons from even farther away.
Graves is too tanky in lane for his burst but I actually agree with some pros that Corki is the one who is even more out of balance with the other ADs, people just don't notice it because he's not as tanky.
Graves/Corki/Ezreal were all major picks because free flash LULZ and theirs are better than Cait's because using hers offensively is almost impossible and Trist's rocket jump can easily mess up. Additionally, all 3 of these ADs have stronger midgames than Tristana, which is why I feel we don't see her in these push-heavy comps.
Corki's winrate is out of line, but mostly the fact that Graves and Corki have NO weaknesses at any point in the game except "if you let it go to 50 minutes, Vayne and Kog'Maw are going to dump on your face if you have equivalent builds" makes it stupid to not pick them every single game. They have literally no risk for their reward and there is not a significant enough difference, especially at high ELO play where people don't sit around by walls for Vayne to get free stuns, between their lategames/laning to warrant picking other ADs. Even strong earlygame champs like MF and Varus don't get picked because lol no free flash and they don't remain AS strong lategame as Corki/Graves.
tl;dr botlane is terribad Riot needs to learn to balance ADC risk/reward.
Also RE: Kayle, she is labeled as a support. I think it really was just nobody knew how to build her or where to put her - her W mana cost is too intensive to really be good at healing, her harass after Q pushes the lane and can steal CS from the splash, so she isn't really a good support. She isn't as good at AD carry in the 2v2 botlane situation because she does not have ranged AAs up 100% of the time and this lets her take harass or miss CS. Kayle is a toplane AD carry who can dump hard on melees and freefarm and lategame churn out the damages. Once Dyrus started playing her as such people realized that was where she belonged and that is how to build her and she became popular and not a "lel kayle sux" pick.