[[Template:categorize]] not categorizing "Category talk" pages

Was that discussed somewhere?

{{attention}} is meant for many namespaces. If it's true that {{categorize}} is meant for entries only, then {{attention}} should not use {{categorize}}.

But rather, I'm skeptical of your statement above. I believe {{categorize}} is good for many namespaces, and the fact that it doesn't work in "Category talk" is a bug to be fixed.

It's meant to prevent templates that are intended for entries from adding pages to categories where they don't belong.