It'd be nice to have a graph that shows aggregate ranking gain / drop. This could be another tab where you currently have them in the overview section. https://screencast.com/t/vithoCVp
Currently, there is no fast way to see if something big has happened. Visibility and Average Position are hard to tell if someone big has happened with G if you have lots of keywords in there. An aggregate rankings drop/improvement can give a high level view that can then be quickly examined at the page or tag level if so desired. Or you could filter by tag or URL on this aggregate rankings graph and quickly see if a page or KW set saw big jumps or dropoffs.
Competitors offer this and it is incredibly helpful for the manangement of large accounts.
Per screenshot, you can quickly see big jumps on Sept 9th and today. Then you have options to sort columns and or change graph based on tags, URL to dig deeper. In 10 seconds you are diagnosing problems/gains where they matter.