We demand the simplicity of unidimensional sequence for that makes most decisions reduce to one of priority. Markup struggles under page layout notations when the page is wide and must be filled for efficiency. Rather than limitation, linear form is a gift to the next editor.
Sites within the wiki federation share content that is on its surface simply lists encoded in JSON.
A site renders lists as wiki pages using builtin and plugin javascript modules. Most have their own markup.
We distribute plugins as npm packages backed by public github repositories.
We distribute scripts we've used to import various document formats into wiki's linear form.