There are only 3 numbers to a programmer: zero, one, and infinity.
Object Views in Object Explorer can accept sets of zero or one.
It would really be awesome if we could author Object Views that receive the entire selected or filtered set of objects in Object Explorer.
For example, filter to a Sales Region in OE, and then look at the Object View that displays Total Sales, etc.
While not explicitly in OE as a first-class feature, this is something that can definitely be done in Workshop with a bit of work (after all, the Object Views for a single object are also created in Workshop).
In Workshop, it shouldn’t be too difficult to recreate a similar view to the “Explore” page if the UI matters (otherwise, just use a filter list widget) and the downstream filtered object set variable can be used to create a customized dashboard that aggregates whatever metrics you need.