Do you have any statistics for that claim? Or is it just your personal experience when you were a new user yourself? Most issues are not performance related. The issue I mentioned above is a good example.
If chatrooms were anywhere close to an unmatched solution (I won’t bother listing their drawbacks here), there wouldn’t be any documentation in first place and the Usage category would be a dead place. Again the issue I mentioned above is a real-world refutation of that argument. Documentation is irreplaceable. The fact is that the majority of Julia users don’t visit the chatrooms in first place, many visit SO, but Discourse will gradually become the number one destination for everything Julia.
That’s not only inaccurate and exaggerating but is actually part of the problem. Multiple partial documentation (often outdated and inaccurate) actually makes things harder for users. The proposed wiki nature of the posts can fix that. Not all users feel like going through long pages of scattered information mixed with low-level stuff, when their questions look simple in their eyes. Providing users with quality up-to-date documentation is much better than giving them multiple ways to relieve their frustration.
Some will not read it. The users who initiated the threads I mentioned above (@davide and @jkroso) would have definitely read it. I even bet that the proposed subcategory will get tones of views and challenge the popularity of other categories views-wise.