You have two kidneys. You only need one. Long before anyone coined a phrase for it, your body quietly modelled the principle we now call resilience at work — packed with spares, one organ at a time, built not to be precious but to last. Evolution looked at the long odds of staying alive and decided that redundancy, a quiet backup sitting ready and unbothered, was the kindest thing it could give you.
The Myth of the Irreplaceable Person
Your ego disagrees. It has its own theory, and it recites it at 2am: that you’re the one who truly understands the client, the unrepeatable knot of skill the whole thing depends on. It’s a comforting story. The body has spent years gently disagreeing.
We’ve always believed this at scale. Every monarchy that claimed divine right discovered, eventually, that divinity has a short attention span. When Steve Jobs died in 2011, the consensus was that Apple had lost the one mind it could never replace; under Tim Cook it went on to become the most valuable company in the world. [SUGGESTED LINK: Tim Cook’s leadership and Apple’s growth post-Jobs] The gap between valuable and irreplaceable is the gap between a fact and a fairy tale.
Work culture prefers the fairy tale. It calls you a “key person” and means it as a compliment — when underneath sits a system that falls over the moment one human leaves. Engineering has a blunter name for that. It isn’t talent; it’s a single point of failure. A design flaw. [SUGGESTED LINK: single point of failure in organisational design]
What Strong Systems Actually Look Like
The body knows better, because it has no ego to defend. Two lungs, two kidneys, two brain hemispheres that cover for each other. A liver that grows back. An immune system that reroutes when a defence is breached. None of this is sentiment. Evolution doesn’t build irreplaceable parts; it builds systems that outlive the failure of any one of them. You are not the jewel in the crown of natural selection. You are a distributed backup system wrapped in skin and anxiety — and that, it turns out, is the good news.
Here’s the part we flinch from, so I’ll just say it. Most of what you do — the emails, the meetings, the decisions — someone competent could learn in a few months. Not the intuition, the relationships, the context you carry in your bones. But the function? That’s a transferable skill wearing your name badge. AI didn’t make this true; it only made it loud. The printing press didn’t make the monk less skilled, only less necessary. We spend our lives confusing the two: defending how necessary we are, and missing what we’re for. [SUGGESTED LINK: AI and the future of work]
Redundancy as a Design Principle, Not an Insult
So before you spiral and refresh your LinkedIn, turn it over. Redundancy was never the insult you took it for. It’s the whole principle of resilience — why planes stay aloft, why your heart keeps beating when one pathway misfires. Strong systems aren’t the ones with an indispensable part; they’re the ones where no part is. When only one person understands the billing system, that isn’t a measure of their importance. It’s a hostage situation. Don’t be the load-bearing wall whose removal brings down the ceiling. Be part of the frame — holding things up precisely because it no longer all rests on you.
And here’s the gift hidden in all of it: once you stop defending how hard you are to replace, you start to notice what genuinely can’t be. It was never the spreadsheet or the code. It’s the way you make a colleague feel human again after a brutal quarter; the meaning you pull out of chaos. None of it fits on a CV, because none of it is a component. It’s the connective tissue — not the parts, but what happens between them.
What Genuinely Cannot Be Replaced
“But doesn’t that mean we’re all worthless?” is the wrong question. It mistakes one axis for another. Any musician in the orchestra can be swapped and the note still sounds — but the ensemble, these people on this particular night, will never happen twice. You’re replaceable as a function and unrepeatable as a presence. You matter not because no one else could do your job, but because you’re the one doing it now, bringing the strange, specific thing only you bring. That’s not nothing. It’s just not what we were taught to call worth.
We need this now, in an age of industrial-scale redundancy anxiety. AI writes the emails; an algorithm makes the trades, with no meltdowns and no lunch break. You are more functionally redundant than any generation before you — and the answer isn’t to deny it. It’s to stop hanging your whole identity on the function in the first place.
You have two kidneys. You only need one. And you’ve spent your whole life not thinking about the spare — not resenting it, not feeling diminished by it, not lying awake afraid of it. You just lived, while the backup sat there quietly keeping you alive.
Maybe it’s time to extend that same grace to the rest of you. The spare was never an accusation that you weren’t enough. It was the most honest kindness your body could manage: a margin, a second chance, the reason the whole fragile system keeps going.
You are not irreplaceable.
You are something better.
You are resilient — and you were built that way on purpose.
