Key delegation and revokation (or even better, rotation) are badly needed, but NIP 26 isn't it.
Some recent discussion on the topic: https://github.com/nostr-protocol/nips/pull/1452
I'm sure your perspective on the problem would be very welcome.
It's not really necessary, because it is impossible.
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Someday I'll sit down and singlehandedly solve social key rotation
Attestations can help I think.
#YESTR