Assuming yours is not merely a rhetorical question, I answered it
several months ago. Here's the gist:
"Usenet itself is now hopelessly inadequate for specialized, technical
discussion. A good forum for specialists will have carefully
demarcated categories, thousands of easily accessible archived posts,
decent search functionality, and judicious moderators. If you go to
the Tennis Warehouse forums, for example, you can focus your query on
a designated topic and subtopic and actually research it as well,
actions that are either impossible or impractical on RST. I used to
participate in Usenet groups for saxophonists and snowboarders that
8-12 years ago were lively places; today they are ghost towns. Yet
elaborately constructed Web discussion groups for these hobbies are
booming, because they make it much more likely that a user will locate
the information sought. The last bastion of Usenet is fan/BS posting,
which of course is RST's raison d'être."