I don't disagree, and I am one of the VPN advocates you mention. Generally there is no issue with exposing jellyfin via proxy to the internet.
The original question seemed to imply an over-secure solution so a lot of over-secure solutions exist. There is good cause to operate services, like jellyfin, via some permanent VPN.
Your English skills beat those of native English speakers I know. Dont worry there. It's not perfect, but I envy your ability to make yourself understood in a foreign tongue.
It's marvelous.