There are a bunch of features within Fargo (the Feed feature for example) that rely on working within a named outline.
I had been including my blog content from a separate file because the only way to define a headline with a domain attribute and also take advantage of the plus icon and the calendar structure.
Now that the domain can be defined as a directive the include isn't necessary and I can use the calendar structure within my named outline.
If you want to host multiple blogs and use the calendar structure I would create a named outline for each site and use the domain directive.