I got a fix for that:
It’s an alternative to 2-2-2 RoleLock, that doesn’t suffer from high queue times, difficult implementation, limited team comp variety, or removing the ability to flex on those who perform poorly in their role. Also it would provide a solution for Quickplay, which would contain 100% of any newly joined players.
✅ [Not 2-2-2] TF2 style Class Limits