Agreed. Many games end without a player on both sides because the losing side leaves. That is unfair for many winning teams
They should add a trigger: if at 5 (or 10, they have the stats, not me^^) minutes there are still players on each sides, then the favor points are recorded. This way they still prevent abuses but you don't have to suffer from it.
The conceide button will probably solve that problem anyway, they just have to add it ASAP.