MMR in team builder?

It needs it. I love team builder, it's great. I can play what I want, and how I want. and as a jungle main, Que times are non-existent haha. But team builder needs some kind of MMR. I'm currently gold 2. If i do a normal, i'm with all high gold-mid plats. But when I do team builder, the variation is MUCH greater. Example: my last game, i have a silver 4 mid laner. their mid laner? Diamond 5. Needless to say, our guy got stomped, and their xerath got monstrously fed and carried the game almost by himself. So why is it that any form of MMR in team builder seems to not do anything? Because I see this a lot. diamonds playing against silvers, even against bronze. Even as a high gold player, I get matched against bronze, and whenever I do, I've noticed that I kind of demolish them. anybody else noticed this? Because I think it's kinda of unfair to the lower elo players. Getting stomped is never fun.