Keep in mind that you don't necessarily need to "migrate" all at once. There's nothing wrong with running both Plex and Jellyfin pointed at the same media library, and using whichever one has the better client for a particular platform.
what are you referring to?
There was something that worked, going forward the core team decided to focus on a tight stream lined core and decruft 'features'.
Discussion:
https://old.reddit.com/r/selfhosted/comments/1dbiw90/skip_in...
https://forum.jellyfin.org/t-intro-skipper-project-dead
Seems like a temporary (indefinite) suspension and a storm in a teacup from those attached to the feature.
There is one big exception though: if you're watching Star Trek: Enterprise. The "skip intro" feature is invaluable so you don't have to be subjected to that truly horrific opening song.