I am going to weigh in on this conversation because I think positional ranked is one of the best changes to ranked in a very long time.
I have been praying for changes like positional ranked for some time. My biggest disappointment in league was playing with people that had such a huge gap in skill level from mine, so If i am playing my main role and they are playing there off role they would bring down the game making it just about a 4v5.
Positional ranked in my opinion solved a lot of those issues, and Maybe you don't understand what positional ranked has fixed.
Before positional ranked my games were decided within the first 15 mins with very little hope for those that were loosing. Usually it was decided by 1 to 2 players that plaid sub par for the rank they were in, and wasted their teams time all because they wanted to play an off role that they had no business playing in ranked.
After positional ranked I found that game play decisions increased considerably because people were playing their primary roles in all roles of the game. It wasn't decided that you would loose the game even if you were behind in the first 15 mins.
I don't play with people that don't belong in the rank I am in on avg anymore. Its been way more enjoyable because i don't usually have to make up for peoples lack of skill in the off role they play just because they decided hey lets play jg today when I am not good enough in jg for the rank i have.
I recently heard from a friend that the abuse of swapping roles has caused some of the reason that people felt it was grindy and that it allowed them to rank up faster because of it.
My understanding is that there was a built in deterrent that if you swapped roles league would basically merge your roles so you were basically playing at the same rank for all roles. Which makes sense why people would think it was grindy.
My counter thought to that is STOP SWAPPING! and abusing the system.. and if your ranked games get grindy THAT'S YOUR FAULT!! you abused the system and that is your punishment, but hey lets yield to the people that take advantage and lets give them what they want because game integrity isn't worth punishing people that take advantage of a loop hole. You know you shouldn't have done it and you did it you should learn to live with your mistakes, and not ruin the game for those of us who thought positional ranked is a good thing.
The game integrity is more important to me than worrying about the grind of each role because you screwed up and did something you shouldn't do..
For those of you that abused the system and ruined it for the rest of us I am disgusted in you.
And Riot, I am disappointed in your wiliness to back down... why get rid of a good thing because of this. I just don't know if i can convince myself this game is worth the money and time I put into it anymore.