Why can a Gold league player play with a Bronze?

I honestly don't understand why basing rankings off K/D and W/L ratio from the start of season 3 would ruin you getting good games. You would literally be grouped up with people of the same caliber without having the issue of playing with different ranks. And as I said before, if you're friends are good enough, then they would be the same rank as you. It almost seems as if you have tunnel vision on this issue because you're doing well in the ranks and if the system changes then you might not reach such heights. I'm not trying to attack you. I'm just trying to understand why you're so against a straight forward system. And if you think over  80 days isn't enough time to grind to the top, you are severely mistaken. That is more than enough time to grind.