If the entire point of FBMM is suppose to dictate that players are fighting with and against team compositions similar to what they are doing, then the lobby balancing also has to be set up to accomplish this as well. I can't count the number of IB games I've had this week that have had two duo stacks and 8 solo players, only for the duos to be placed together against all solos. I get that sometimes games with this system will have some odd games set up occasionally, such as an uneven number of stacks, different sized stacks, etc. But when there does end up with a perfect split, what sense does it make having the FBMM in place if the stacks are just going to be paired together anyways?