Request that we get some more Mastery points for Champs in Defeat

If I get an S or even an A, why am I getting a tenth or even less mastery just because I lost? This has never made sense. I feel like losses should still reward a decent amount of mastery if you still did well. I mean... as a Jungler and Support I consistently ward, get drags, have high kill participation, etc. If I lose a game but get a B or higher I feel like I should be getting a lot more than 100 mastery when the enemy got 1100 despite receiving a B rating when I got an A or S.

And if you disagree, explain why instead of downvoting. Like really, the point of having mastery there is showing how experienced you are with said champion. Experiences are shaped by Victory and Defeat alike.