Why Most Startups Fail: Founders Don’t Know What They Don’t Know Yet

What if the real edge in building and investing in companies is knowing exactly where your knowledge stops? In this episode of Built Not Born, host Sage Nye sits down with Dave Fachetti, Partner at Venture Guides, to unpack the operator–investor mindset that drives durable outcomes. Drawing on decades of experience, Dave explains why great founders prioritize solving painful, urgent problems before optimizing execution, and how this “efficacy before efficiency” mindset underpins true product-market fit. He introduces his “know what you don’t know” test as a lens for evaluating founders, emphasizing self-awareness, curiosity, and coachability as critical traits. The conversation also explores cap table strategy as a long-term system, the importance of aligning all stakeholders, and why board dysfunction guarantees failure. Dave shares practical frameworks for hiring, leadership, and navigating AI opportunities, while highlighting the balance between conviction and listening. It’s a grounded playbook for founders and investors aiming to build resilient, high-performing companies.