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.

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.

Here’s what you will learn:

How to evaluate founders using the "Know What You Don't Know" test
The critical difference between efficacy and efficiency in product-market fit
Why "painful problems" are your moat in B2B software
The cap table management principle that founders ignore at their peril
How to build a leadership team that scales without micromanaging
The "dysfunction guarantees failure" principle for board dynamics
Why the "move fast and raise big" AI strategy works for only a few
How to structure investor relationships that actually help

Dave Fachetti is a Partner at Venture Guides, a seed-stage investment firm focused on helping early-stage founders navigate the path from idea to growth. With nearly three decades of experience at the intersection of venture capital, cybersecurity, and executive leadership, Dave brings a rare dual perspective as both operator and investor. His career spans managing directorships at GlobeSpan Capital Partners, where he backed companies acquired by Citrix and Pegasystems, to serve as Chief Strategy Officer at BitSight, a cyber risk intelligence leader with $200M+ in revenue. Dave's operating experience includes scaling Family Education Network to 4M+ monthly visitors before its $175M acquisition by Pearson.

Episode Resources:

Dave Fachetti on LinkedIn
Sage Nye on LinkedIn
Venture Guides Website
Built Not Born on Apple Podcasts
Built Not Born on Spotify