To expand on a point made in another thread, the perspectives on our data which we are calling "Projects View" and "Contexts View" are really a Planning view vs. an Execution view.

This is why the "Projects View" does (and should) include lists which do not contain projects, such as the Inbox, and the currently discussed list(s) of singletons.

HOWEVER the slight misconception of the execution view as a "Contexts View" is leading to a gap (which has also been mentioned in another post) - namely, the "Contexts View" lacks (and should certainly have) a list of actions with "Context Unassigned".

The basic point is that everything on our radar should be visible in both the planning perspective and the execution perspective.

The planning view needs the Inbox, and the singletons list(s), as well as projects. (Perhaps its name needs to shift from "Projects".)
Similarly, the execution view needs a built-in "Context Unassigned" section in addition to all the user-defined contexts and sub-contexts. Possibly its name could also be adjusted.