Feedback : I'm not a fan of the position ranks.
Even with the splash, I still don't care much if I'm in in my main role. It feels really crappy to have the amount of LP you gain or lose from a game be determined by an invisible algorithm that decides what lane I'm in, and just over all it feels very cluttered. I only care about my League rank. Just as part of my rank is my ability to change my build/champ to different games, part of that skill is the ability to play different roles. I don't have enough shits to give to pay attention or care about five whole ranks, I only care about my main, my off lanes could be iron for all I care.
Edit: That means I feel even worse about getting placed in an off lane now. Off lane games are just a waste of my time, I find myself simply dodging the game rather than wasting my time on what I see as basically a normal game. If I wanted to play norms, would have qued up for norms.
More than anything the problem is apathy, I don't care about my off main roles, when I win I don't feel very rewarded and when I lose it's not that big of a deal.
In fairness I have not played that many games yet, so it might even out, but I wanted to throw my feedback anyway. Riot, I know you why you want position ranks, I know you have tried hard to solve the apathy problem, but my initial thoughts still lean in a negative mood for the entire change.
What's so bad about how ranked is, and always has been? Ya, I know there are a lot of answers to that, but I also know that for every problem you "solved" with the position ranks you just created new problems. Ranked has been going strong for closing in on a decade now, it's an effective model that people like. It's like flex que, no one was asking for it. I'm wise enough to know I might have a change of heart as time goes on, but I have the same feelings about position rank I had about flex que. It's a good idea in theory, but in practice is just clunky and un-fulfilling.