The question was intended as "what should I be looking to post", since very, very few of my posts seem to get any responses. But with your list of things you're interested in, it seemed clear that very little of it turns up here.
There's very little traffic, and I'm wondering what the few people here are interested in. The lack of traffic is ... troubling. I'm not finding much of interest, and I'm thinking about giving up, but unwilling to do so without giving it a "proper go".
My perspective is that the volume is low enough that one reposter or even one blogger greatly influences the average direction of the site.
In that sense, I think someone going in a niche direction with posts could give a niche that interests them (and is not the main perspective of some larger site) a try on this site and have a slight headstart on bringing that niche to the larger sites..
The opposite direction for this site, would be if everything on HN were reposted here or with equal chance.. Then the site/community has no specific direction of its own, and why make comments here that could be made in the larger community with the same general focus?