Hi. I was looking through my previous ideas in this thread, and damn were they not great. I have some more thoughts, and I promise that I've thought through these ones this time.
First off: tutorial unification. Currently, tutorials exist on the wiki as a scattered collection of pages without much connection, which is not as useful as it could be. What I propose is the creation of a pair of user manuals for Fortress mode and Adventurer mode intended to be read from front to back (the old tutorials could be merged into these manuals, or just archived). Maybe the Fortress mode manual could take someone from embark to breaching hell, and the Adventurer mode manual could take someone from character creation to defeating a vault. The rest of the wiki would continue to function as a reference manual to be dipped into on an as-needed basis. (I'm stealing the idea of a separate user manual and reference manual from Vim, by the way.) Now, I realize that this would obviously be kinda a fucknormous project, perhaps unrealistically so, and in some part due to the fact that neither mode is particularly linear. This may not be possible.
Second thing: I don't really think that having a separately-maintained namespace for each major version of the game is the best way to solve the problem of older versions. Instead, what I feel would be better is to have the null namespace (is that the correct name?) be used for whatever the current version is, and have guides be available on the main page for using older versions. I don't think this on its own is enough, though, so I think that to improve this, each page documenting a game feature should have a history section detailing the history of that feature. Now, I realize that this would be a complete overhaul to the way that the wiki works, and it could definitely be completely impractical. There's also the fact that something would need to be done about the old pages, and I'm not sure what the best method would be. This may not be possible.
Third thing: I don't really see what the point is to having a separate page for each and every stone/gem/tree/creature/etc. when it seems to me that it would be better to unify them into a single list page with subpages for particularly notable examples. With how many similarities there are between a lot of these pages, compressing them seems like it wouldn't be too difficult, just tedious. Of course, we'd then need to figure out what to do with the old pages.
Final thing, and this is kinda what ties all these suggestions together, because this assumes that they all got implemented: I don't think the main page is as good as it can be. However, unlike the previous time I complained about the main page, I now have a kinda-sorta fleshed-out idea of what I think an improved main page would look like. At the top, in an extremely conspicuous box, would be links to the user manuals for Fortress and Adventurer mode. Under than would be the quote and picture of the day side-by-side, and then several boxes for things like core gameplay mechanics, lists of things like stone and gems and trees and whatever, guides to previous versions, external links, and probably some other things that I haven't thought of yet. I do, however, realize that this would probably be a very controversial change.
One last thing: It appears that <ref></ref> tags don't work on the wiki, which seems rather inconvenient.