We’ve actually tried in a few seasons doing something that amounts to a partial SR reset across seasons, but the results were pretty horrible. When you queue for a match with an SR that doesn’t accurately reflect your skill, the quality of the match drops tremendously. Therefore, we try to quickly change your SR as a new player to more accurately determine your SR, and we can’t ever really consider implementing a full SR reset. Match quality would be harmed for months until everybody played a lot of games and the matchmaker could properly identify everyone’s skill again.