We have been using the Community as a place where we can post announcements that don't quite feel right as an article. I'd love to see community posts come up in the Knowledge Capture app. Here are a few use cases on why it would be worth while.
Community Post to Knowledge Article. In the event a community post comes up as the solution, it might be worth adding an official article into the knowledge base. The Knowledge Capture app could be a starting point to converting that content.
Filter by Answered/Completed posts. Maybe an article doesn't need to be created and the post is good enough. Maybe filter the app to only show Answered posts.
Voice of the customer. What better way to capture the voice of the customer than to use their actual questions in the community?