Maybe you are right, either if the function of posting in multiple territories will be released, I still think it is a great feature! In the ~AGORA we'd use it for the weekly series and other recurring post

OneOneSeven

I don't see series as something that makes sub-territories obsolete, at all. Someday, there will likely be a ~parenting territory or sub-territory and Parent Corner would just be a series that mostly lives there, but the series has a more restricted scope than a whole territory would.

Undisciplined

[SN Brainstorm] New type of post: "Series"

There's probably some crossovers where a sub-territory would work in place of the series.
E.g., [Movie Reviews] as a sub-territory where the topic won't stray from the territory.

But something like [ASK SN], [Parent's Corner] might be posted in different territories. 
Or someone has a personal series and they want to jump from topic to topic in their posts.

