First, you are conflating categories. SSC is a blog -- a place where one person (or maybe a few) posts content and the visitors consume it. Comments are secondary and are not that important. LW is not a blog -- maybe it was once long time ago and it still misleadingly calls itself a blog, but functionally it's a forum attached to an archive.

One important difference is that blogs have ownership. I'm not talking about the legal sense, but rather about the feeling of responsibility/control/caring. When things are not owned by anyone in particular, there are... consequences. Consult the XX century history for particulars. LW used to be owned by EY. Right now it's not owned by anyone in particular.

If you want LW to go back to being a blog, you need to find preferably one, but not more than 5-6 people who will commit to the care and feeding of LW and who will have power to change things to their liking. But, of course, future is uncertain so as the result the LW might flower and be rejuvenated, or it may crash and burn.

The alternative is to treat LW as social platform, a forum, where content is provided mostly by the participants. Yes, you do not get solely high-level content, you get a lot of low-level stuff, too, but that's a filtering problem which has many well-known solutions. At the moment LW's filtering capabilities are rather... rudimentary.