Loss Forgiven for Game-Long AFKs?

So I know there is a remake option in place now, but what happens when someone leaves 10m into a game? I know there are a lot of excuses against Loss Forgivens, due to scapegoating and such, but there has to be a way to stop punishing 80% of a team whenever someone rages a little too late.

What would be the problem with granting a Loss Forgiven to the remaining players when a player from a team is gone for over half of the game?