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Let me give you a familiar example from sports: being one second behind the winner in a 100-meter race and in a 400-meter race are completely different things.
That's exactly what I was saying earlier, comparing races of 100, 200, 400 meters, etc.
P.S. Both your system and IronAxe's system have drawbacks, which have already been discussed extensively. But IronAxe's system still more accurately reflects the skill of the players participating in tournaments.