When reading a page using the default /view/xx/ mode, the page-tools sidebar does not offer many of the usual features. E.g.
https://www.wikifunctions.org/view/en/Z10106
whereas looking at the same page with /wiki/ mode does provide those tools. E.g.
https://www.wikifunctions.org/wiki/Z10106

As a reader/editor I want access to features like what links here and permanent link

One editor notes they've made a "load mainspace" button in their common.js , which just loads the mainspace version of the object, as a workaround for this problem.