It's a good idea, but it wouldn't work very well. Streamers and people who do carries in general would just not purchase the boons and just reset their passage upon completion of the carry or failure of the carry to stay in the lower tier playlist for easier games.
You might ask, "What about their lighthouse trip?" Those that do carries all weekend have(I'm just going to assume)have been flawless so many times that they don't need any of the gear going flawless has to offer anymore. If they do however, they can just wait until the last day to do it.
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They could make it where if anyone on your fire team receives ultimate victory, you too get thrown into the flawless playlist. Sucks for you, but you would have to use boons or beat other flawless teams to get 9-0. This would eliminate carries unless they only did one per character per week.