1. Homogeneous teams create an illusion of efficiency through quick consensus, but this masks deeper productivity drains 2. Groupthink in uniform teams leads to self-censorship, conformity pressure, and the systematic exclusion of alternative perspectives 3. Innovation requires cognitive friction—homogeneous teams lack the diverse perspectives needed to spark breakthrough ideas 4. Market disconnect occurs when teams create solutions that only work for people like themselves, missing larger opportunities 5. The expertise trap makes homogeneous teams blind to changes in their field, as deep expertise in one approach prevents seeing alternatives 6. Communication monocultures exclude valuable thinking styles by optimizing for only one type of contribution 7. Homogeneous teams tend to hire similar people, creating a recursive problem that deepens over time