Problem: When section names are updated in an article, it's difficult to find which articles link there, making it much more difficult to update broken section links.
Proposed solution: When caching Special:WhatLinksHere, add which section (if any) they link to. It would also then be possible to automatically generate a list of articles with links to sections that no longer exist.
Who would benefit: Editors trying to find broken section links, and so readers who will be redirected to broken sections links less frequently.