The entire game revolves around ADC

-They get an entire lane with a dedicated support who must ward for them early game so that they can scale into late game. -They are given a lane next to the most important objectives for the most part of the game -First tower gold was designed to funnel money into a specific champion, which now, on the pro scene is majority of the time given to ADC -They have the best scaling into late, the best penetration; -They are ranged and have been given great, if the best items. Items that remove CC while amplifying their damage. Items that stop burst damage. Items that give the best sustain, and now items like GA are pushed towards them. -Apparently, the last 2 season, Riot decided to give them waveclear that is on par with most wave clearing mages, if not beat many other champions -Pro scene, top lane must take teleport now because everything important is in the bot lane..(ADC/Dragon) -APC/Assasins constantly nerfed because there is one role (ADC) that must never building defensively.

Lets not forget that riot has worked overtime on trying to give supports more meaning other than being slaves to adc's. This is a indirect buff to the role. It's ADC roles who get the benefit of new items like Knight's Vow, Mikhael, redemption..etc They even benefit from their supports getting more passive gold because it means more safety and ability to live through early-mid game.