I am not really sure how the UI is related to the ranking system… UI means how the game look and feel looks like. It is only about how everything is presented to the user. All the math behind a rating system isnt part of the UI (afaik)…
The current inflation is the result of the old calculation and it is slowly going away. Months ago the 50% percentile was around 1500, currently it is about 1300. So inflation isnt really the main concern to me. The biggest issue is the unbalanced games, mainly because of all the smurfing to boost main acocunts. The other reason of unbalanced TGs is the result of the old badly fixed rating calculation.
I wish the devs changed the calculation to something much more meaningfull with much less flaws and reset all ladders. How to fix the calculation? Analyses of the ratings - Spotting the issues already contains multiple possible solutions.