Just to jump in here - the change we're making is NOT that round difference does not affect RR gain. It still does. Round differential still matters in calculating MMR and RR. Winning is still the most important part of gaining RR.
What we are changing is how much of the MMR/RR gain is affected by Winning, vs. Round Differential. Specifically, we're putting slightly more emphasis on the Win/Loss, and slightly less emphasis on the Round Differential. To repeat, both still matter (we're shifting the weight)!
There is an additional change we're making to weight individual performance more than both Win/Loss and Round Differential, but that's for a specific case where your MMR and Rank are very far apart (not for the average player).
Additional context: The reason we wanted to make this change is to make RR gains less swingy based on the round differential. While we do want to reward people for stomping their enemies (and similarly, reward players who may have lost but tried their hardest to scrap as many rounds as possible), we were doing this too much to the point that RR gains and losses were all over the place. We want to reduce this a bit. We'll keep an eye out on how the data looks into the new Episode and make further adjustments as necessary.
Wanted to clarify this bit. Thanks for bringing this up for discussion and let me know if you have questions!