User blog comment:DaNASCAT/Technical Update: May 6, 2015/@comment-5558012-20150506182506/@comment-452-20150508132454

At the moment, WantedPages isn't useful as it's filled with pages that have been deleted or links of no reference to the wiki. It would be nice to have the option of having links to these pages removed in the background when they are deleted so this never happens. An automated function to "remove all links to this page" when deleting a page would be convenient, but would be complicated, and difficult to "undo".

I'm not casting aspersions on you, but I've always seen it as an administrative task to remove/update links to deleted pages so they don't appear on WantedPages. (Of course, admins are free to simply not care about WantedPages, but it would be pointless for them to complain about things they chose not to fix.)

I look at Special:WantedPages almost every day to ensure that every red link on WantedPages is something that users are free to create. Well, except one, which is kept as an example of a bug I reported to Wikia Staff over 3 years ago.