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What do you think about separation of Q&A feed to specific branches, like Ask Ubuntu Hardware Q&A, Software Q&A, Drivers, Games and so on ?
There does already exist a separation between different questions based on Tags which are applied to questions. These help in the separation of questions in different categories. I do not think another level of separation is required.
You can already get a feed for a specific tag (the link is on a tag page in the same location as question feed links).
If you want a group of related tags, you can use an SE tag set.