User blog comment:DaNASCAT/Technical Update: May 6, 2015/@comment-4714517-20150507163550/@comment-5645428-20150508123449

I highly emphasise the importance of the kind of maintenance that Insights is promoting, and do think that having positioned it somewhere as visible as it is will definitely attract both new and experienced editors to take to clearing its lists. The point where the module becomes unnecessarily space-consuming is when all the lists are cleared. By that point, it should temporarily hide itself.

Maybe to reduce the space it takes up (presuming new lists like Special:WantedFiles are added in the future), perhaps admins should be able to select three or four lists requiring the most attention to display on the module at one time. Otherwise, padding between lines could simply be reduced.