In real life you train during training sessions, but you use what you train during games (this is when you really find out how much practice helped). I realise that real life is different to the game, but my point is that if you have a forfeit in real life players wouldn't play at all, and so wouldn't get to practice what they had been training. However, in this game, there are no training sessions, so it is important to get minutes for the other team forfeiting.