Yes I understand your proposal. But some games then 3 points are win, 1 each plus 1 and some two points are won. Which means in my opinion some games become worth more than others. Which is why I don't like it.
An extreme example to prove the point. Imagine we are sitting 7th 1 point ahead of 8th and 2 points ahead of 9th going into the final round (worse for and against then both). 9th beats 8th in GP. Both jump us because their game became a 3 point game when it shouldn't have been possible.
Although I don't agree with your proposal, the reality is there are few enough GP games for me to really care about value distortions, and I think pretty much any suggestion is better than what we have now.