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Okay, so how do you bootstrap a new server in that system?
What do you do when you just created a server and can’t get new users because you aren’t whitelisted yet?
But what if you do handful of users to start out, or just yourself? How do become ‘active’ without being able to federate with any other servers? Talk with yourself?
Very similar heuristic here, insofar as when to use passphrases and how long.
LUKS and Bitlocker volumes get 8 words, computer logins usually get 4 words (potentially more depending on frequency/criticality of system).
Smartcards and mobile devices do have numeric pins due to frequency of use and relative difficulty in copying those for offline attacks.
Websites that are filled in w/ password manager get passwords get the random symbol-laden strings that ‘meet requirements’