That's my impression as well. A friend and I created a pastebin as a fun weekend project this weekend (https://www.pastery.net/) and we used Persona for auth, since it's so damn convenient. The only problem is that it loads a bunch of files on every request, and my questions about lazy-loading went unanswered.
I really wish Mozilla would change their mind and start developing this again. It feels like they expected all major websites to support it on the first year, and, when that didn't happen, they decided to drop it.
They're primarily for content ownership management.
I'd prefer not to have accounts, and Ghostbin tries to avoid keeping identifiable information around, but they do come in fairly handy for maintaining control of the things you've pasted and the right to revoke them.
Session cookies aren't quite up to the task, since they can't stick around forever and are difficult to bring with you between workspaces.
(edit to elaborate on "avoid keeping identifiable information": account names are hashed, the account never stores user identification, and a paste doesn't track which account created it. For most intents and many purposes, the creator of a paste is anonymous. We could get into drawing correlations between all the pastes owned by an account, but I'm not particularly interested in sitting around and doing that.)
Preventing inundation with pastes. This is less of a problem for a small project like this compared to one of the major sites, whose server architecture is probably more robust.
I think they're saying that even if Mozilla may not decide to actively develop Persona anymore, Persona users and fans would be able to contribute to and further develop the project if the repo is "open and available."
I agree sometimes it takes someone with weight to throw around, but are you saying that person needs to be a Mozilla employee? Because I wouldn't agree with that.
I really wish Mozilla would change their mind and start developing this again. It feels like they expected all major websites to support it on the first year, and, when that didn't happen, they decided to drop it.