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The Doorman Fallacy

Core Concept

You ground your understanding of value in only the most visible function, while failing to appreciate the full scope of tangible and intangible value that exists just under the surface. You optimize for Surface Value and unknowingly destroy the Real Value that made the thing worth doing in the first place.

The name comes from Sutherland’s thought experiment: a consultant tells a five-star hotel to replace its doorman with an automatic door — saves $40K/year. Two years later the hotel is a catastrophe, because the doorman was also doing security, hailing taxis, handling luggage, recognizing regulars, and providing status. None of that was captured in the “open-the-door” definition.

The Two Layers

The fallacy: assuming that Surface Value = Total Value. Every time.

How to Recognize It

• The efficiency pitch: “We can automate/eliminate X and save $Y” — but the analysis only accounts for the visible function
• The substitution test fails silently: You replace something, the replacement technically works, but something downstream starts degrading in ways you can’t immediately trace back
• “Something doesn’t feel right”: The canary in the coal mine. When an optimization succeeds on paper but the system feels worse, you’ve likely destroyed Real Value
• Post-hoc surprise: “We didn’t realize how much the [role/process/practice] was actually doing”

Where It Shows Up

In Leadership & Organizations

Before automating a role or eliminating a process, ask: what is this person/process actually doing? The doorman isn’t just opening doors. The office manager isn’t just ordering supplies. The code review isn’t just catching bugs — it’s knowledge transfer, mentorship, shared ownership.

Connected principle: Management-Philosophy#Electricity or Blood? asks “can electricity do this?” The Doorman Fallacy is the essential counterweight: before you answer, make sure you understand what “this” actually is. The three-step hierarchy becomes:

1. Understand the Real Value (Doorman Fallacy check)
2. Can electricity do it? → Automate it.
3. Can someone else do it? → Delegate with intent.
4. Only you can do it? → Do it.

In the AI Moment

The current rush to automate everything with AI is a Doorman Fallacy at civilizational scale. Before replacing a function with AI, you need a clear view on the Real Value — not just the Surface Value that shows up in the efficiency calculation.

• Writing: The Surface Value is the output (words on a page). The Real Value is the thinking required to create it. Outsource the writing, lose the thinking.
• Code review: The Surface Value is catching bugs. The Real Value is knowledge transfer, mentorship, shared context, team cohesion.
• 1:1 meetings: The Surface Value is status updates. The Real Value is trust, psychological safety, early warning signals, human connection.

In Personal Life

• Cooking dinner: Surface Value = calories. Real Value = connection, ritual, slowing down, doing something together as a family.
• Handwritten notes: Surface Value = the message. Real Value = the care and thought that only a slow medium produces.
• “Inefficient” traditions: Surface Value = the activity. Real Value = the identity and meaning they create.

The Helen Garner Test

“At dinner the surgeon asked me why I write with a pen rather than using a dictaphone or a word processor. ‘Why would I?’ ‘Because it’s faster and more efficient.’ ‘But it’s my life’s work. I’m not in a hurry.’”

When someone suggests optimizing something that matters to you, ask: Is this my life’s work? Am I in a hurry? Many of the most meaningful things in life look inefficient through the wrong lens. That doesn’t make them wasteful. It makes them human.

How to Counter It

1. Audit for Real Value before optimizing. Before automating, eliminating, or outsourcing anything, explicitly list both the Surface Value and the Real Value. If the Real Value column is empty, you haven’t looked hard enough.
2. Run the “two years later” thought experiment. Sutherland’s hotel was fine on day one. The catastrophe took two years. Ask: what might degrade slowly if we remove this?
3. Listen to “something doesn’t feel right.” When an optimization succeeds on paper but the system feels worse, take that feeling seriously. It’s usually Real Value asserting itself.
4. Distinguish between efficiency and effectiveness. Efficiency is doing things faster/cheaper. Effectiveness is doing the right things. The Doorman Fallacy happens when you optimize for efficiency at the cost of effectiveness.
5. Protect the human in the loop. Many roles exist precisely because a human provides judgment, relationships, and tacit knowledge that can’t be specified in a job description or a prompt.

Related Patterns & Concepts

• Management-Philosophy#Electricity or Blood? — the principle this counterbalances. “Can electricity do it?” is the right question, but only after you understand what “it” fully entails.
• Management-Philosophy#Andy Grove’s Black Box — managing through abstraction requires trusting the middle, but trusting the middle requires understanding what the middle actually does. The Doorman Fallacy is what happens when you abstract without understanding.
• High-Output-Management — Grove’s leverage concept focuses on output/input ratios, but only works if you correctly measure all the outputs (including the invisible ones).

Origin

From Rory Sutherland’s Alchemy (2019), surfaced via Sahil Bloom’s article (Feb 2026). The concept immediately resonated as the counterweight to the “Electricity or Blood?” principle already in Dave’s management philosophy — a reminder that before you decide whether electricity can do something, you need to understand the full scope of what that something actually is.

The Helen Garner quote (“It’s my life’s work. I’m not in a hurry.”) captures the personal dimension: not everything worth doing should be optimized.

Cross-References

• Chesterton’s Fence — closely related. Doorman Fallacy is about misunderstanding the value of something. Chesterton’s Fence is about misunderstanding the reason for something.