Leaders and teams make their worst decisions when they base them on assumptions. Working by assumption keeps things simple, which they sometimes are. The naturally curious know that things are not always what they seem. When we work by assumptions, the complex seems simple, which it isn't.
Each of us and each team have different capacities for navigating complexity. When people and teams get overwhelmed by it, they use assumptions to make sense of the complexity. This never works out well. They miss important opportunities and fail to learn their way into an effective approach. Assumption based tensions and conflicts are unnecessary and unproductive, even risk making.
The mindful approach to complexity is through questions, curiosity, exploration and trying out new things. When we begin decision processes, all that matters is how well we articulate and organize our questions.