Role queue will affect Competitive and Quickplay. This allows for more security in being able to play the role that you want to. One player could have a high MMR with their main role, but a low MMR with a role they rarely pick.
You can't talk about GOATS without talking about Brigitte and one would imagine that the introduction of Role Queue will mean some big changes for her and other heroes and tow the various role lines. Rather significantly, it seems. Role Queue will be implemented both in Quick Play and Competitive modes, with each role having their own queue and skill rating that the player can rank up in.
"Here's how it works: role lock is in place an entire map, so players can swap to any hero within a role but can only change roles between maps".
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Further, it should improve overall balancing and team composition: a player in Gold, for example, may select a hero in a role they're not familiar with, and so their play isn't a true reflection of where they now sit in the rank if they've made it to gold with a completely different role. The maximum number of placement matches is now 15, up from 10, while the minimum is now 5, down from 10 as well.
For Competitive, players will receive a separate skill rating for each role, and will require five placement matches be played per role to rank at the start of the season. While the league stayed mostly quiet on the subject, rumors of the role lock becoming a reality began to surface during Stage 2. While this might make team composition in matches more rigid, it's also bound to ensure people play their roles instead of just hopping around between different characters every time they die. That beta season will run from August 13th to September 1st, with the Role Queue going live in Competitive and Quick Play on September 1st as Competitive Season 18 kicks off. Players can earn Competitive Points similar to other competitive mini seasons and qualify for Top 500 Leaderboards during the beta season. But considering Blizzard's usual testing phases, it shouldn't be longer than a month.
However, the role queue system is created to help ease and expedite this process which, in turn, should lead to more exciting matches and an environment that encourages teamwork.