In my opinion it would be more appealing to have the Related Pages above the sources section, or somewhere in between the paragraphs, so its more available and visible, rather than hiding it at the very bottom of the page.
Topic on Talk:Reading/Web/Projects/Related pages/Flow
This post was hidden by Tacsipacsi (history)
Putting between two sections is much more difficult than just at the end of the page and also can cause errors (e.g. what to do if there is not exactly one such section or it's just somewhere in the middle of the article). Localization is also more difficult as the software needs to know all possible section titles.