By default, every category has one of these “about X category” topics pinned. They’re not very visible at the moment, because we’re using the /latest view as homepage. It’s possible to switch this to /categories to make more use of the category structure.
Example of this being used well: https://community.humanetech.com/
Mostly though, we need someone to champion it :] Between recent excellent posts I feel like my forum bandwidth is pretty saturated again and will focus on keeping Write the Initiatives Plugin going.