Rank by role
Why do we consider a player to be the rank of their best role when that means that they are likely rated at a lower rank in any other role?
I think this is one of the reasons that Autofill is way off at the moment.
If someone is a Diamond Mid player but they are pretty much Bronze as a support, I can't blame them for not wanting to play as a support against Diamond players.
If the system ranked and matched players based on their rank in the role that they were in that specific role it would be a lot more fair.
I actually think this would also encourage players to improve their skills in each role individually, including support.
Maybe that Diamond player doesn't realize that he is Bronze level in support and seeing that would encourage them to learn the role so they can compete on a higher level overall.
A player can still claim that they are their highest rank and rewards can be given based on this as well (since that is how we do it now) but this would help people to have a better understanding of their own skills across different aspects of the game.