My biggest issue with Jellyfin is that remote access requires additional steps (which many of my family would not be comfortable doing on their end) and even if that hurdle didn't exist, it would still be significantly less secure than providing access through Plex.

What issues do you have with jellyfin?

I'll start using Plex when Jellyfin stops working consistently.

I have literally never had a problem with jellyfin. It works great on everything. It slices, dices, cures all that ails you.