There is one thing missing in my super factory that I would love to have: a chest where I can set an item filter, and robots will bring that type of item to it as if it was a requestor chest, but use it as a provider chest if an actual requestor chest is asking for an item of that type.
I often have the problem that one factory becomes so big that my logistical robots have to fly through the entire screen to get an item from point A to point B, and I would love to have a chest that lets them place that item in a chest right in the middle of my base and then transport it from there where ever I want it to go! That would be awesome.
EDIT: I added the below text!
Here is a screenshot that perfectly illustrates my point:

The active provider chest is utterly full, and there are empty storage chests nearby. Almost a hundred robots have absolutely nothing to do and sit in their roboport and do nothing instead of emptying the full provider chests into the storage chests.