Riot: Have you tried anyone getting S-Rank on your team gives chests?
Okay, so it's easiest to get S if you're going pure CS/split push and pretty much ignore your team. You're gonna get higher rank on average if you let two people on your team die rather than sacrificing your life for them. Getting an S means free cosmetics, because it grants chests, which kinda doubles down on the incentive to play purely for the system rather than for the team.
Currently you only get chests if your teammates get it if you enter a queue together with people. However, if it was widened to everyone, queued with or not, wouldn't people feel better about other people on their team getting S? Wouldn't in incentivize playing less selfishly and helping assure those on your team who were ahead didn't get killed(generally a good idea anyway for winning)?
Have you already tested this? If so, did it cause other issues?