A business cofounder is the founding-team member responsible for non-technical functions: customer development, sales, fundraising, business model design, go-to-market, recruiting, and operations. They often (but not always) serve as the CEO, hold founder-level equity (typically 25-50% in two-founder teams), and bring skills that complement the technical cofounder's product-building capabilities. The role is controversial in startup discourse because the value-add is often less visible than a technical cofounder's "they built the product" contribution. It is the most-debated cofounder role in startup culture: dismissed by some as the "idea guy" or "BizDev person" who isn't actually building anything, defended by others as...