I heard it was about queue times, but what's the point of queuing up to get a role you don't even play?? You won't know any of the match ups, or how the champs work, or the synergy of said role. Basically a troll pick. Riot needs to either REMOVE it, or revamp it to where people will get their roles without worrying about queue times.
Your "revamp" is part of why we have Autofill.
Long before all of this, players were expected to have some degree of proficiency in every role. Pick Order for Draft basically meant that if you were last pick you got "auto filled" that game - so you expected to be "auto filled" ~20% of your games. This kept everyone on their toes, and lead to people frequently saying that if you didn't know 2-3 champions for every role you weren't ready for Ranked.
Then the New Champ Select came out, which introduced the idea of picking two roles. In response to feedback from Team Builder, Riot added a Fill option. However, while Fill in Blind Pick got you Support ~40% of the time, Fill in this new system resulted in you getting Support almost every game, due to the number of people selecting other roles. There was a similar problem for people who put Support as a secondary role, they got Support all the time. As a result of getting Support more often than they wanted, people stopped putting Support Secondary/Fill - which made the problem worse for those still doing it.
As a result of too few Supports, Matchmaking and Queue Times started to go downhill, particularly in the higher ranks. Matchmaking would wait ~5 minutes to try and find a Support at the player's skill level, then it would lower it's matchmaking expectations and search again for another few minutes, then it would lower it's expectations even further, so on and so on until it found a Support. The Support player, while likely a Support Main, would be in a game with players way above their skill, and would get completely destroyed and not be any help to their team.
In response to this skill discrepancy, Auto Fill was born. The idea was basically that a more skilled player would do better on a role they don't practice as much than a significantly less skilled player on a role they main. Considering everyone had been expected to be somewhat proficient at every role before, this was a reasonable expectation. It started out applied to only the highest Ranks, but then Auto Fill was applied to all players as a way to prevent the Support burnout that started the whole problem.
Now people don't play their off roles often enough, which has lead to them being too out of practice when they do get Auto Filled. They've allowed themselves to become worse than players several ranks below them.
Riot's trying to respond by having 2019's Ranked have separate Ranks/MMR for each role, and having those ranks interact with each other. In theory, it would mean that when you're Auto Filled to a position you suck at you'll be matched against worse opponents, balancing out the Auto Fill.
You can usually switch autofilled roles for everything except support. People just don't want to support at all and that's why there is the problem in the first place.
