Hi Bernhard,
in case a bug is found during a conversation, it should be definitely filed as such in Bugzilla.
However, my understanding of Jon’s intention is to provide a helpful template for users who are not sure if they are dealing with a bug (or do not know about Bugzilla). In some cases such as the The .work TLD ironically, doesn't work topic, things look like a bug in the first place, but turn out to be misconfigurations later.
Perhaps adding a short notice such as “In case you are sure about your problem being a bug in IPFire (!), please open a bug at https://bugzilla.ipfire.org/ rather than starting a new topic.” might be helpful to catch the obvious ones. @jon: What do you think about that?
Thanks, and best regards,
Peter Müller