Correct Me if I am Wrong, But Here's the New Bot Meta
You have your ADC whose job is to farm and secure turrets as per usual, but instead of them scoring kills, it is now entirely up to the support to burst down the enemy bot lane so as to clear the way for the high DPS adc.
ADC gets all the CS gold or most of it anyway while support scores most or all of the kill gold.

Plus some others I may have forgot to mention are the juicy picks for the support role since supports can no longer supplement their income adequately through support items. They must now actively steal kills from their allies, leaving behind the scraps that are the minion waves.