Without seeds, torrents become almost useless, and many pirate sites offer rare and hard-to-find movies/animes whose torrent versions never download because their seeds are practically extinct forever. So I don't think this is a weak complaint. If torrents didn't have this weakness I would always choose to use them but...
Usenet is awesome, but the fact that you have to pay for Usenet access defeats the main purpose of pirating for a lot of people.
Don't get me wrong, it is super cheap(60$-100$/year?) and worth it to pay for Usenet from what I understand, but as a poor kid that discovered torrenting out of necessity, paying for Usenet back then would've been out of the question. I imagine a lot of Gen Z kids feel the same about it at this point in their lives.