@blaine i'm wondering to what extent fedi would implement webfinger if mastodon didn't require it
i think if i had to really pick a format for identity then it would be a weak preference for FQDN, but having your id be a pretty-url is also okay i guess. but one other thing that i think would be cool is being able to find your contacts via webfinger if they choose to make themselves findable by other means! so you could do wf?resource=tel: or ?resource=mailto: and still get back useful info...
@trwnh fun fact, webfinger actually supports URLs and [in theory] phone numbers!
The key (and this is a social science and cultural insight, not technical) is that when you ask someone's "name" or "address" they need something that's unambiguous, personal, and opaque in the sense that it works everywhere (online / distributed, it needs to be globally unique, too) or they won't use it.
Bare domains aren't ideal because (1) they're expensive and (2) management is hard.