These are why I think it is the best solution for KDE as a platform
1. Open source. We can take the source code and add it to the infrastructure (so it is KDE hosted)
2. It has easy access for logging in (facebook, twitter, linkedIn, Google+).
3. While though it doesn't have a large developer base, it seems moderately maintained.
For the Krita instance of this, I was planning on re-skinning it after it would be hosted, so it should look quite nice and consistent. For the point of view about bad answers being written...
Even looking at Krita's documentation on KDE, it is not up to date. In other words, there are errors for anyone that tries to download Krita now and seek instruction from the 'source'. We have to realize that as a user base gets larger, it will become impossible for developers to answer the amount of questions people have. We have to think of a better way to rely on the community to help us with this aspect. We already ask the non-KDE community to do things like find bug fixes, feature requests, an test builds.
Having people help is usually a good idea (I think most of us here are volunteers). There will be bad answers on the Q&A platform. There will also be excellent answers as well. People expect there to be bad answers on a QA platform. People expect the voting system to help filter out the bad, not eliminate it .
It is possible that you will get bad answers from doing a google search. Does that stop you from using search engines?
those are my thoughts
Scott