I think the best arguments I heard about it was, unlike torrents, the availability is longer. Because the "nodes" store them generally for years at minimum UpTo even decades.Downloads are as fast as your broadband connection, just regular SSL communication, hence no VPN. Don't have to join private trackers, and prove you are worthy enough to be allowed to download.
You dont have to join private trackers, but you do have to join a private usenet provider. The only companies holding years/decades long retention of files are the paid private ones.
Breadth on Usenet is a lot worse though. One can find a private tracker to cover pretty much every -non mainstream- niche one can think of, and that also comes with a community attached.