Exactly this. Jellyfin shouldn’t be available externally (even with a reverse proxy!) which means a personal VPN is your only realistic option for remote access. But that means you can only remotely access it on devices that can run a VPN. So grandma’s smart TV is probably disqualified.
Plex makes remote sharing much easier, so it’s what I use for friends and family. I got the lifetime pass like a decade ago, and I have gotten my money’s worth out of it a hundred times over. Luckily, Plex and Jellyfin will happily exist side-by-side, so there’s no real reason for me to choose one or the other.