Every now and then, I write an LW comment on some topic and feel that the contents of my comment pretty much settles the issue decisively. Instead, the comment seems to get ignored entirely - it either gets very few votes or none, nobody responds to it, and the discussion generally continues as if it had never been posted.
Similarly, every now and then I see somebody else make a post or comment that they clearly feel is decisive, but which doesn't seem very interesting to me. Either it seems to be saying something obvious, or I don't get its connection to the topic at hand in the first place.
This seems like it would be about inferential distance: either the writer doesn't know the things that make the reader experience the comment as uninteresting, or the reader doesn't know the things that make the writer experience the comment as interesting. So there's inferential silence - a sufficiently long inferential distance that a claim doesn't provoke even objections, just uncomprehending or indifferent silence.
But "explain your reasoning in more detail" doesn't seem like it would help with the issue. For one, we often don't know beforehand when people don't share our assumptions. Also, some of the comments or posts that seem to encounter this kind of a fate are already relatively long. For example, Wei Dai wondered why MIRI-affiliated people don't often respond to his posts that raise criticisms, and I essentially replied that I found the content of his post relatively obvious so didn't have much to say.
Perhaps people could more often explicitly comment if they notice that something that a poster seems to consider a big thing doesn't seem very interesting or meaningful to them, and briefly explain why? Even a sentence or two might be helpful for the original poster.
I've noticed this phenomenon. I always attributed it to the idea that most people gain their motivation to post via some sort of competitive attitude*, and once something ends the debate, there's nothing much more to do but shrug it off and move on. I sometimes imagine the person struggling to respond, and then coming up with some unrelated reason it's not worth their time, and then forgetting about it.
Also, anything sufficiently new as to be groundbreaking is often met with "meh" much, much earlier than the time anybody starts appreciating it. It's much less common for some big insight to be recognized right away than for it to drift around in the dust for a long time, until people dig it back up later on and give it credit.
*I'm not saying their real motivation is competition. I'm just saying that's the visceral thing that impels the action often. For example, there may be a lot of these 'debate-ending' posts that aren't responded to simply because people had akrasia and didn't get around to responding the way they would have if it was still a heated competition.
I'd like to think that this community can recognize and overcome that, accepting reasoning more readily, and realizing Singularity-type thoughts much sooner. Rather, I'll believe this until proven otherwise. Not sure how else to motivate myself to bother trying.