The LessWrong wiki does not seem as well used as it should be. I guess this is a lack of editors.
@Vladimir_Nesov made a good point that many standard wiki-editing features are missing which makes the prospect unappealing.
The point is that absence of the feature makes engagement with the wiki less promising, as it becomes inconvenient and hence infeasible in practice to protect it in detail, and so less appealing to invest effort in it. I mentioned that as a hypothesis for explaining currently near-absent editor engagement
So in the spirit of this, what features would cause you personally to edit a lot more than you currently do?
I may try and pay some devs to write the pull requests if they seem feasible.
Addendum: Apparently parts of the old LW1.0 wiki were imported as untaggable "wiki" pages (basically just tags with an internal checkbox which prevents them from being associated with any posts). Example page.
These pages are not visible on the Concepts (All Tags) page, either, except for one link at the top which mentions this import process. The wiki pages can be found via the search, though. I'm not sure whether they can be reached or found anywhere, otherwise.
So that's one more point in favor of Tags being implemented almost entirely as a tags system, and barely as a wiki system.