So his complete destruction against 4 opponents and one tie is somehow worse than your 3 dominating wins while just eeking out 2 other matches. The way I see it some of your modified wins probably could have really been considered draws to begin with so maybe that 5-1 should really be 3-1-2 instead. When people are willing to start a game with fewer than 100/100 points spent just having a few points difference in what is on the board should NOT be enough to determine an actual winner.
How could his mod wins be considered draws? He completed the task of the game- to destroy more points than his opponent. There is no question he was the victor in those matches.
Why could a modified win be considered a draw? That's a stupid question although the answer has nothing to do with points.
The only real win is one where you completely destroy the other side although even then there should be times where you may win the battle but that battle could still cost you the war. Presumably when there is a modified win the game is close. A close game should still be able to go either way and when it can go either way it certainly looks the same as a draw.
Ignoring a number of the other conditions if you had one side destroy 96 points worth of ships and the other side destroyed 100 points then who should be the winner? I guess the side that destroyed 100 points is "obviously" the winner, but then why would ANYONE ever bring a 96 point squadron into a 100 point match? Perhaps that 100 point list has points that are completely wasted against the smaller squadron but in the end the two may still be well matched and the final result should be a tie/draw when they manage to destroy each other. Now just turn that down a little bit at tell me why destroying 50 points on one squadron really makes it so much better than the other side destroying 48 points?
Going pure W-L may make scoring simple but that isn't the same as making it accurate.