Think of that one person in your office—or that one outside vendor—who is the only human on earth who knows why your server hums or which ancient password unlocks the payroll portal. When the system crashes, they swoop in, mutter some jargon you don’t understand, and save the day. You feel relieved, but you really should be terrified. This isn't expertise; it's a hostage situation. By allowing your critical business logic to live inside someone’s head instead of in a documented system, you’ve turned your company's valuation into a single point of failure.