Even my most recent ex, who's nearing fifty and has never been especially at home with tech, found nothing objectionable about using it via the iOS native app - with the content of my library, yes, but that's no more fairly blamed on Jellyfin than it would be on Plex.
If I didn't care about those things, I wouldn't use a media server at all. I'd just point Infuse at an NFS share.
Besides that, I purchased the lifetime pass in 2014 when I don't think Jellyfin even existed.
FWIW, I've been using Plex for a very long time, since when it was XBMC. I originally ran it on an Xbox.
It just works for me. The only thing that really annoys me about Plex is that it requires an active Internet connection. If my ISP goes down, I can't access my media via Plex. That's just dumb.
Otherwise, I'm happy with it.