The image linked above is not a custom game. It is a public control match result from 5 minutes ago (23.4.2023 - 4:10 PM MEZ).
If 5 of 6 random players in a control match leave your crucible BECAUSE of the opposing team being too annoying and too strong to beat at all, then you know you failed your task as a developer to deliver a working experience. Even the people performing better than myself in my team did quit the match, because it was ALREADY pre-decided which team will win due to your C/SBMM-tactic of forcing a 50-50 win rate still.
If people have to take savage and humiliating losses in a loot based game because you can't come up with a better system, at least have the damn charity to give the people pre-decided taking the loss better rewards for the suffering. Mark them as "Balancing"-Matches or something and inform the losing team they will get better rewards for staying in the match til the end.
Otherwise it is only discouraging from playing the pvp side of the game at all.
Oh and also get rid of all 4v4 maps from Vanilla in 6v6 modes. It is clear they don't work well for 6v6, even a blind man can see that by now.
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The problem is quitting isn't punished harshly enough. And JIP isn't particularly fast (for fair enough reasons). The best PvP shooters in the industry still has people who quit for whatever salty reasons.