I suppose it's then more of a cost thing.
if you use something like stremio or Kodi with Debrid, all content is also available the moment it's released. If not, I'm sure a private tracker is just as fast with releases as some of the big public trackers. I can't believe something will be available on a private tracker before it's released on something like 1377x as an example. Maybe I'm wrong, like I said I have no experience with private trackers.
I understand why a private tracker would be used if it's free and more "safe" than a public tracker. But torrents in general are dodge AF, even if I use a private tracker I won't use it without VPN, and I'm always sceptical how good a VPN really is, if it disconnects a split second your IP is exposed. Hence me using debrid, which is cheaper than any VPN i know off, it's much faster than any torrent, and its safe as you are not the one downloading the torrent (which is one of their selling points)