Gamer,
Well, for one, you might not know who is a 5 point opponent or a 4 point opponent. Granted, you’d be able to track the number of wins/losses and have some idea of who is “upper level” and who is “lower level” but until the end of the year, when the percentages are official, you’d only be able to guess.
For instance, in Febuary you could play someone with 7 wins 0 losses who is, literally, a 5 point opponent at the time. But if that opponent then loses 28 more games and wins no more games by the end of the season, their status is 7 and 28, or 20% win ratio thus they are reduced to a 1 point opponent. Likewise, if you go into March with a record of 0 wins, 9 losses then win 31 games and lose 1 more game you are 31 and 10, or 76% making you a 4 point opponent, when it looked like you would be a 1 point opponent.
Basically, the idea is to have uncertainty. Is your opponent going to be worth more or less points? But it also rewards you for beating the stronger players at the end of the season. Hopefully, the outcome will be that everyone has an equal chance of playing everyone else since no one knows who will be worth more points than someone else is.
The idea behind not losing points for losses goes with the rationale of why should you lose points? You are awarded points for winning! The number of points you win is determined by the number of wins against harder opponents and the number of over all wins.
Example:
1) Player A beats Player B. Player B has 10 Wins, 1 Loss and is worth 5 Points. As Player A only played Player B, then Player A ends the season with 5 Points.
2) Player C beats Players D-J (7 players) all of which had 0 Wins and 1 Loss at the end of the season. Thus, Player C earned 7 points.
3) Player Z beats Players X and Y both of which had 4 Wins, 1 Loss at the end of the season. Thus Player Z earned 8 points and won the league.
While Player C played the most games and got the most wins overall, he still lost because he didnt play tough enough opponents to garner enough points to beat Player Z. Player A played one of the best players (ratio wise) but had the least amount of points because he did not play enough games to get points. Player Z won because Player Z played against moderately skilled opponents, not trying to snipe the weak players, but not trying for Hail Mary games against really tough opponents either. In this way, Player Z was able to earn enough points to win, while not playing so many games and risk distraction.