[2022] 1 tier spread

Matchmaking is the primary issue, although Gameplay Variance would also suffer from limiting the available ship options you could expect to see.

I don't have a figure to offer as to what would be needed to move matching to +1/-1. Our playerbase would need to be significantly larger to be able to accomodate something like that while still aiming for short queue times as a goal.

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You mention other modes. Most other modes are single or dual tier specific, so that does already occur for those specific formats.