It would list only Wikipedia articles, not all conceivable topics!  There is also a list of mathematical topics, which has hundreds  or maybe thousands?  of entries, and a list of physics topics.  Take a look at those.  As it states at the top of the page, one reason why such a page is useful is that you can click on "Related Changes" and monitor editing of articles to which the page links; it's a "Recent Changes" list, but restricted to articles listed on this page.  18:55 Mar 6, 2003 (UTC)