I mean that, maybe you should distrust your own judgement that "HN is the only reasonable discussion forum remaining on the internet". Perhaps other places have environments that you don't like but other people feel that they are "the only reasonable discussion forum remaining on the internet".
> I'm part of a ton of other forums and communities, and over time almost all of them have devolved into complete and utter dogshit, just an endless stream of memes and screenshots of Twitter posts.
In my experience this has a lot more to do with algorithmic instead of chronological ordering. Facebook for example, where a lot of communities have gone to die, is a context-destroying engine. Only memes and shitposts can survive. What is the point of writing something thoughtful if you don't know if anyone will even see it?
Otherwise, online communities have a lifetime. Before HN there was Slashdot and Kuro5hin. They were nice at some point, then devolved into shit. Same thing will happen to HN and everything else, of course.
> The communities that remain successful either have total strict moderation or a "shitposts" section where all of the garbage ends up, but even then the quarantine zone ends up sucking up a lot of the forum energy. I think it's best to just not have it at all.
My favorite community uses a completely different strategy: there are no moderators but it is relatively obscure. Shit posters come and go, nobody reacts, all is fine. It has been going on for more than two decades. I will not disclose it because I do not want to ruin it, but I bet lots of things like this exist. They don't make money nor are they advertising arms of money-making operations, so nobody really cares. No newspaper will ever write an editorial about them -- this is why they are so great!
A perfect example is the other poster who basically got called to task by dang for asking for sources to a claim. Dang characterized it as "unsubstantive" and lowering the signal to noise ratio.
For myself, a reasonable discussion is one which it's expected to be asked to cite sources. A community in which not doing so gets you called out.
Discourse on HN is too touchy feely, people are generally afraid to challenge others in a straightforward manner, so they end up using a lot of words to do so. It's like being in that meeting where the manager is using flowery language to extol the virtues of the company, when in reality everyone is there for reasons that don't involve the company itself.
I just kind of tolerate it, but in no way, shape, or form, do I view the discourse on HN as generally being honest or useful.
I'm glad your favorite community has sustained itself for 20 years, but with this statement you remove it so far from the category HN belongs to that it's incommensurable.
It's great that there's room for lots of different internet communities to thrive with different strategies. I've always felt there's room for many more—there are lots of opportunities for communities to start with different initial conditions and grow into qualitatively different things. I wish people would start them. But let's not pretend that they all have the same problems. HN's category is that of the large, public, anonymous internet forum, and all its hard problems stem from that category.