I work as a Usability Engineer, therefore I know, that Usability and UX (User Experience) are important aspects in application design.
The user @ArminWeb also asked for the same feature here:
So, this is a feature, which is also important to other users.
@samuelclay I encourage you to add an additional icon at the bottom, which shows only the filtered feeds.
This way I can mark all news that are not important (filtered out) as read and then focus on the important news.