But at the same time, the practice of regularly and routinely recycling user identities is ... well, it really does prevent the formation of a community.
The most toxic community I'd ever encountered was a supposedly "kinder and gentler Reddit", the late and unlamented Imzy. A core feature was that individuals could spin up a new pseudonym on each individual thread.
The result was both absolutely disorienting and gave rise to vicious bandwagon and brigade attacks.
Whatever problem Imzy was trying to solve, that was the wrong solution.
(I'm aware that chans often follow a similar tactic, and that ... they tend not to engender highly constructive behaviours.)
And of course, HN stands at odds with this theory as well. No one "knows" me on HN. I don't have a reputation, or a real identity, and I'm cordial enough. (I hope) HN enforces conduct, and this enforcement is not defeated by anonymity.
That's not one you're willing to make and you adjust your behavior accordingly. HN can't be all things to all people. And that's okay.
You clearly find some value in HN as it is because you continue to use it. Something to consider: changes you might like to see may very well change the community as a whole to make it less a place you want to be. Hard to say, without running the experiment, but one of the hazards is that running the experiment could irreparably damage/change HN. And rebooting it would be likely nigh impossible. (If it were easy, we'd all create the fora we wanted.)
Interestingly, this attitude used to be default even here on Hacker News ~5 years ago. I am so glad to see it's changing. Why I'm finding this interesting? Because this audience always knew what's going on even without layman articles like this, but did not care for some reason. This shows how just knowing isn't enough sometimes. Public sentiment matters.