I feel like ADC is beyond important, and this meta resolve about getting that ADC into God mode
There is soo much explanation in the current meta, I could give you. Support having high winrate? Because they impact the early game. An ADC thats fed is unstoppable, said by Imaqtipie. There is soo much Black Cleaver and Youmuus build by other champion which help the ADC to deal even more Damage to Tanks. Lifesteal is way too strong on An ADC, especially with Warlord. Like a post Earlier talking about an Illaoi Dying to a Warlord Twitch in which all he did was right click. An ADC can end the game after acing the enemie team.
Why can the game be just about good players that makes the Team Shine and not a single role. Back in Season 3 an ADC was still played, its not a role that you can just remove from the Game. It had a balanced impact on the game, unlike right now.
Why do you guys think Rammus has a High Winrate, because he counters ADC. He is probably one of the last armor Tanks who can deal with the ADC. ADC complaining about getting 1 shot by assassins? Have you seen an Caitlyn headshot Orianna? Dear lord the crit.