Thread:Energy X/@comment-4101084-20151016193949/@comment-2170536-20151017002632

In general, there's not a lot of reason people should be editing other users' personal pages. However, there are some instances where it's perfectly appropriate: If the user is active, it's preferable to leave a note for them to take care of it themselves, but often they either don't know how to, or don't care. Often they will ignore the note, but then fix it after their page has been edited by someone else.
 * Offensive or otherwise inappropriate content
 * Invalid or incorrectly-used categories
 * Broken links (at least those that reference things that aren't likely to be created)
 * Other situations that create entries in Special:Insights or the Admin Maintenance Reports (broken/double redirects, tags, etc.)