I'm curious, but if it's a proven fact that one cannot carry, should one ever bother with ranked? Sure, I understand Support mains exist, but I don't quite understand how that even works if your win condition is based around which team gets the worse carry.
You CAN carry from support. But basically only with 
or 
in my opinion.
Basically, your team's bot lane cannot win without a support. The difference in supports heavily influences the outcome of the laning phase and the utility a support provides can also determine the outcome of teamfights. The reason is that just about anyone can play a champion that attacks other champions. They are a dime a dozen in this game.
