Jellyfin has automatic port mapping, but it's been hit or miss in my experience. I use Zerotier for remote access, but I forget that not everyone wants to take the time to play around with stuff.

Relevant XKCD

For the sake of not being trapped by Plex I could deal with all the other problems everyone's listed here.

But asking my friends and family to either use tailscale or for me to leave that open highly complicated open source project dangling out there on an open port...