Individual user accounts, so multiple people can use the same device without needing to log into a new account each time. For example, User A watches a show on the TV. Then User B opens the TV, and has to log in to be able to access their own watch history. Then User A returns, and has to log back into their account.

Braindead remote access. I use a reverse proxy so it’s not a need for me, but plenty of people don’t understand how to properly set something like that up.

Single Sign On. It flies in the face of what Jellyfin stands for, because it would require a centralized authentication server that everyone’s servers phone home to. Just like Plex. With Plex, you log into one account, and can see all of your available servers, because they’re all tied to the same account. With Jellyfin, every server requires its own authentication, because there is no central server to manage all of the “Account XYZ has access to libraries A, B, and C” stuff. If I want to watch something, I can’t easily just search all of my servers at once; I need to individually log into and search each one to see if it has the content I want to watch.

not sure your logic here. Why would Jellyfin have the same features as Jellyfin?