Frankly I dont think that this is the case.
I have the same issue with bf6, sometimes I win 700 to 0 playing worse than usual, and sometimes I loose 0 to 700 with kd around 3-4 and 15-20 objectives captured. So I think SBMM is the issue in this case. And in spite of everybody hating it EA still decided to implement it into the game so low-skill noobs can win games no matter how they played. I hate it as much as everybody else, cuz if I win or lose no matter how I played I feel no impact on the game, and game becomes very frustrating when your team is full of morrons who dont know how to play bf or shooters at all because of the algorithm.
This is not balance of teams. This thing only makes you win or lose the same amount of times.