Nobody. It seems that Devs act on their personal emotions.
Xenos got 5 combat queen in a row and they all died, but managed to win the game? Devs: implement young queen mechanic.
Other dev: you implemented young queen mechanic? Muh, I will revenge nerf. Implement order 66, unlimiter larvas. Reason...revenge...I mean no. Marines lost planet? Doesn't deserve a last change of intense fight. Make them ghost or cyro.
Instead of acting on their emotions devs should ask us questions: "is it fun?" or "Do you like the changes?"
Of course 95% would reply, they HATE it. But it will be still kept for "balance" reasons. When was the last time time you really had fun playing CM?