Why Most TAM SAM SOM Calculators Fail Founders When It Matters Most You're three weeks away from your Series A pitch. Your deck is polished, your demo is flawless, but when the VC asks, "What's your TAM?", you realize your $50 billion market size is based on a generic industry report from 2022—one that doesn't account for competitive patents, regulatory barriers, or the actual technological readiness…