A question about Champion Mastery Points.

Why do I gain points based on winning or losing when it's about the champion I played? Wouldn't it make more sense to gain points based on how you performed with the champion you played in a game instead of gaining more points when you win? For example, I could have played very badly with my champion but still win the game and get a lot of points, but when someone on the other team played really well with his champion but lost he gains way fewer points will he should deserve more than me in that case since he performed better with his champion than I did. Or am I seeing it wrong and winning a game simply gives you bonus points?
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