In business and product planning with teams, I love it when people have “passionate beliefs loosely held.” What that means to me is that as you argue it out, bring passion and fire to your articulation of an idea. Believe in that idea fully in the moment. That will give it its best chance of being convincing and thus becoming a reality.
But also hold that idea loosely, and be able to let it go in a few minutes. That allows ideas to flow and the best option to be adopted by the team.
For this to work, there must be trust among the members of your team, each must realize their ideas are not always the best, and each person must make the mental switch from “I want to be right” to “I want us to be right.”