The biggest thing was syncing watch states across multiple servers. We have access to a number of Plex servers and it’s super simple to have the state of each episode synced & saved so you don’t need to think about it.
I tried a few plugins for Jellyfin but could never quite get there.
Outside of that we’ve had some other smaller issues. Not to be rude but the Android TV app is… bad. We have a lot of issues trying to fast forward / rewind in the app. Many times fast forwarding completely freezes playback, but if I fast forward to a point, hit back to go back to the episode page, then hit “resume from <time stamp I fast forwarded to>” it works great. So jumping from minute 1 to minute 10 doesn’t work, but going from min 1 to min 10, closing the episode, then hitting “Resume from minute 10” works great.
It’s a lot of small frustrating things like that. However, Jellyfin definitely has its upsides. It plays high bitrate / high res files more smoothly than Plex for sure, both from a local and remote network. I’m not against it, it just feels more like “something for a tech guy” and less like “something for the whole family” right now to me. I look forward to the day I can switch without concern though.
Everyone playing seasons has to start a new character. You also don’t have access to your old stash / gear.
Especially for those who play with friends it can be really fun to put everyone at the exact same point again and allow you all to play through again. Seasons are usually big updates that add new unique / legendary items, new gameplay mechanics, new quests, etc. You play the season, get whatever loot and whatnot you can, and (if you want to) try to rise up the seasonal leaderboards. Once the season is over, you can move your character over to a “non-seasonal” character and continue to play them whenever. At this point, Diablo also merges those changes, new loot, etc. into the general game for everyone to get.
So you can generally get all the seasonal stuff later on even if you don’t play the season, but you have a better chance of getting seasonal loot during the season.
That’s basically it.