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Group brainstorming is useful for creating a domain set of ideas to test and kill, especially if a simple-ish or vague problem needs to be solved immediately when optimal soon isn't required. Multiple people together can sometimes create better ideas through on-the-fly refinement. But, people who are less assertive aren't able to make their voices heard or convince others about alternative ideas.

Independent contributors have the potential of submitting better ideas privately utilizing individual creativities not biased or pressured by group dynamics.