You don't have to seed. Connections are secure and encrypted. Speed is generally much faster, and more reliable. Things will either download in full, or fail pretty quickly, no hoping that 1 seeder comes online. Things are often posted to Usenet before torrents.
There are drawbacks too though.
100%, as well as DMCA take down requests, and needing to often pay for indexer and provider.
That being said I still think it's far superior to torrents, though I do maintain a good ratio on a large private tracker for those odds and ends I can't get on Usenet.