Libraries were simple enough, sure, but have you delved into the full settings? Trying to figure out the correct settings for QuickSync hardware acceleration was a mission in and of itself and there's very little guidance on what any of the options mean or do. I don't have the container running right now or I'd provide examples, but In Plex it's a single checkbox.
I'm sure Jellyfin will get there and it's a cool project, but it's fairly obvious that it's written by hobbyists, for hobbyists. Meanwhile Plex excels at just working straight out of the box.
Yes? It's not uncommon to see discounts stick for the life of the sub. It locks people in because they don't want to lose that sweet deal, sometimes even if there's a cheaper/more appropriate package elsewhere.