Why isn't there a Team builder in ranked matches ?

I'm sure this question has been asked before but I was wondering why there isn't a team builder in ranked .Because I know we've all had the mid or feed ect, I personally don't mind playing any roll and I understand its good to have people to learn new rolls but in the event of say last pick getting a sup only too find out they don't have a sup or an ADC who doesn't have an ADC would hinder a match too the point where your not being matched via skill but by what roll you get in the champion select. I'm not QQ'ing about not playing my favorite roll in fact I enjoy most rolls but I'm sure that getting a Russian roulette of players getting rolls often hinders the game.
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