I am not exaggerating when I say TiddlyWiki is one of the most flexible solutions that exist. Assume it can be done, rather than what It cannot do.
Perhaps the key similarity to wikis is the way content in one place can be linked, even automatically to content in another place.
You can let anyone edit tiddlers if you use a server version such as bob but if you look closely at Wikipedia/Wikimedia you will see although they are designed for anyone to edit, they must get a user id/set a password, and they can still control what changes you make and reverse them if inappropriate.
- There are ways to implement this in tiddlywiki especially on node.
Another way to look at single file tiddlywiki’s is they still can be collaborative but the editors can be serial editors, first me, then you …
However another feature of a wiki is the content is made available for everyone, something most users gain from Wikipedia without any editing, however like other environments its full of links, searchable, bookmarkable and more (Like subjects, categories, hierarchies etc…), this not at all guaranteed on most websites even content management systems, or web 2.0
I have treated TiddlyWIki’s as a document as well, letting SharePoint do the document handling, allowing a user to check out the wiki, make and save changes and check in. In this way anyone (with the rights, and one at a time) can edit the wiki. You can’t easily do this outside a single file wiki, or one accessed through a server.
- This means that it can also be treated as a document along with being a brochure website, an interactive website, an application, a server or team site.
Rather than call multi-user an afterthought think of it as an evolution. The server was there from early in tiddlywiki 5.x history, but for other reasons.
Personally I have also a Proof of concept for allowing read only contributors to make changes and submit them to the owner for application with or without moderation.
- It is also possible to integrate your wiki with third party solutions from google sheets, to commenting tools, to allow specific contributions to the site without changing the wiki itself.