One thing Plex does better is media detection. Like you can plop all your shows in a folder and it still will make sense of it. Jellyfin insists on a very specific directory structure and file naming. It’s very frustrating if you only want to watch a show and not interested in maintaining a perfect library.
Funny, I found no issues with it.
Maybe the way I organized my library intuitively sort of matched Jellyfin's expectations?
They both insist on their own systems and both are wrong.