New champs in Ranked

What is it with people playing new champs in ranked, in ever game I have had recently, I've had people that only have a couple thousand points, or a couple hundred, or even worse, 0 points on a champ. Why don't people go learn the champ properly in draft anymore and think it's ok to cost people their games and LP by using new champs in ranked. This needs to be fixed, and a limit put on mastery for ranked, because I'm fed up of losing games because of idiots that think it's ok to do this.
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