I don't think the OP is assuming that, but it's not unreasonable to consider that lots of brand new accounts created to comment on cryptocurrency may not be authentic - primarily because they may have a vested interest to shill / be astroturfing.
However, it is a signal, and a fairly strong one, for authenticity.
Somebody trying to build or maintain a certain reputation or a particular public image, for example, seems like a lack of authenticity to me.
Implementing any barriers towards communication will incentivize people to be agreeable or not speak their full mind, if they have to reach a certain karma threshold or tie it to an easily traceable identity.
Moderation is pretty good here from my experience, and it's an excellent place to get information from others without worrying about the identity of whom you are engaging with. Honestly a breath of fresh air keeping it more old school than modern social media platforms.
I mean, that's what an account with the word "bot" in it created 4 days ago would say.
A secondary reason is that it helps to protect me from falling into the trap of caring about imaginary internet points.
"Throwaway accounts are ok for sensitive information, but please don't create accounts routinely. HN is a community—users should have an identity that others can relate to."
Sure, everyone would rather be anonymous given the chance, but it's not what this site was meant to be.
I like the theory that I heard on Wranglerstar a few days ago, that when Jesus gave his lecture about not casting stones... he wrote out the sins of those present in the sand, so that each person could see that he knew, and then he could cast that knowledge away.
In the future, everyone will see your foibles, and accept them.
OR
An Algorithm will use them to divide society by using hypocrisy as a wedge.
Maybe a generation or two of dredging up digital sins will get us there.
Maybe I'm too naive to think this will never happen but people's opinions change over time: some get reinforced while others become irrelevant.
Your writing voice, anecdotes from your life, what topics you understand and are interested in, it all comes together with enough time.
Not everybody wants to be bothered with all of that. Doesn't mean they're bots. It's worrying how often people assume that disagreement is necessarily inauthentic.