"When you queue up for a match, the system begins by searching for players and parties closest to your MMR value. As your ticket moves through the queue and the matchmaker starts to assemble a potential game of 10 players, it navigates the difficult tradeoff between holding out for teammates who are more similar to your skill level and ensuring that you’re able to find a match in a reasonable amount of time.
While some players might advocate for longer matchmaking times and slower MMR range expansion in exchange for matches with a narrower range of MMR, there is a practical limit to how balanced you can make matches given a certain population size and amount of time players are willing to wait before giving up. We made a conscious decision at the beginning of Early Access to bias towards faster matchmaking times to ensure players can play more matches of Predecessor while we continue to develop the game, and while we still believe that to be the right course, we acknowledge that the quality bar for match fairness has suffered as a result.
We’re sorry, and we’re working hard to fix it."
From 2023, but feels like no improvements were implemented today.