How's the rpi4 as a media server? I wanted to do that too, but i looked into it when the 3B was new and the general consensus was that it wasn't really ideal.

As an aside, raspberry pi's are so cool. My rpi3b running retropie/ emulation station turned out so great, and it runs way more games than I expected.

if your userbase is not just IT workers and FOSS enthusiasts (...) Plex is the place to go.

What does this even mean? My 6 year old niece uses jellyfin, it's actually simpler than netflix. I may be biased because I'm not into frills but I think the UI looks great. I've admittedly had a few non-critical bugs with the UI (web, flatpak, android, roku) but most all of them have been worked out now. Plex is more polished and has a much larger ecosystem like you said, but the rest of this comment is not the most reasonable.

I have a large amount of users on my Jellyfin instance including people who are more tech illiterate and nobody has had any issues. The setup of Jellyfin is probably more complicated than Plex (just guessing, I haven't tried it) but besides that, the UI is very user friendly

I've only used Jellyfin, but I struggle to imagine Plex being much easier - it was a piece of piss to just run the installer and point at my folders. Complexity only comes when doing stuff like making it available over the internet.

First and foremost, I don't know or particularly care about fanclub opinions as a whole. Not trying to be rude or anything, but it's weird to tell me that A is great despite what B fans tell me when I never even heard a word from B fans to begin with.

I've looked briefly into plex recently, which seems bloated with services and monetization that I don't want or care about (even the help articles are written like ads), and I've looked at the 3 websites for Jellyfin that I linked, and Jellyfin seems like a more clear cut and feature rich version of what plex started out as, which was primarily a media server program.