Because if I'm watching locally I dont need them, and if I'm watching remotely Plex already offers secure remote viewing 'out of the box`. They give every user an SSL certificate and a public accessible URL at app.plex.tv. They also handle secure user authentication. The new price is stupid, but Jellyfin is not a 1:1 replacement.
I'm pretty sure I saw something on the blu-ray special features about this? It was gonna be too expensive to have the creepy worm alien things as a recurring enemy so they made the Borg as a cheaper alternative.