Why MM doesnt mirror stacked teams?

Why the MM doesnt put 3-4 stacks against each other ? Most of the games i get to play 1 side has a stacked team & the game is so much of a stomp it is not even fun, and the score is garbage for it too.

I was playing Soviets BR III today & all of the games we were deffenders with 3 stack vets on our side & probably it took a few min max and the Germans couldnt ieven reach the line where we were not even alowed to go deeper into their spawn. They didnt even touch the objective.