Currently any location article will show all the related session reports (primary or secondary) near the bottom of the sidebar's content panel. This list can get quite lenghty if a location is very important to a story.
In some cases this can mess with the desired format of the article (i.e. if specific sidebar-text is supposed to be next to a part of the main text body, adding new session reports will mess with that) or it may cause other autogenerated links to be moved way down in the sidebar (i.e. inhabitating species) which makes it more difficult to register those items at a glance.
Toggling visibillity might sometimes work as a workaround for guild members with access to said feature but if the players want to make use of a report's link, toggling the visibillity off would of course prevent that.
I'm all for being able to make things more collapsible in general! Collapse everything!!! <Ok, that might be a little extreme> But yeah, collapsible sections in the side bar would be great.