Hey,
i think this is a valid point. As long as users would choose the correct subcategory it might work, but the real world shows that the subcategories are often not used at all.
What about a something like this:
- News
- FAQ (IMHO should be one of the upper categories)
- Server
- Desktop-Client
- IOS-Client
- Android-Client
- Development (could include GSoC as well)
- Marketplace / Apps
- Events (could include GSoC as well)
- Meta (could include ownCloud.org category as well)
Not sure about the “Other” category, there are often questions like Larger virtual box partition which are unrelated to ownCloud. What about these?