Yes. That’s kind of the point of it… think Emby, but some of the Emby devs didn’t wanna sell out, so they made their own open source version…

Technically yes. But you have to set it up yourself/it’s more technical, manual and involved.

I’m in the same boat. I’m part of a big friend group on Plex which makes it awesome.

this is a big pain for me as well. So right now I still just run plex + jellyfin at the same time on my server. Locally, all over the house, I use apple tv with the Infuse app connected to jellyfin to stream everything which works perfectly, but I have family members and friends who stream from my media library outside of the house, and they all use the plex app. I’m not sure of a way to get them connected to my jellyfin library. If/when I can figure that out, and more importantly, make it dead simple for the end users, I’ll gladly close down the plex server for the last time ever.