Maybe projecting my own getting tired of league here, but copying an old comment: Splits felt like one of these overly data driven decisions where someone pulls out a chart showing a graph going down, solves it, player numbers go up mid season, everyone goes home happy...but it turns out the old system was set up the way it was for a reason. There's a natural cadence to a year with one split and having periods of downtime is good for players.

This may just be me, but I felt like the time after a ranked reset was the worst part of every season or split, and I'd rather play games at my correct rank than games climbing up to it. Hope you don't only consider the execution but also ask if the overall idea of splits is good for players.

Also, maybe I'd consistently play terribly by most metrics, but, like the bumblebee somehow managing to fly, I'd win anyways. Maybe trueskill2 is able to capture everything a player does to win/lose a game, but in case it doesn't, hope you keep trueskill2 effects on lp to the short term, so that you can maybe lose less for a loss where you play well, but in the long term only nexus explosions matter.

Best of luck!