It seems easy enough (so far) to ignore/disable all of the new features, and the new features seem to provide a nice legal raison d'être for the software.
It's possible that it'll be harder in the future, but so far Plex still compares favorably to all alternatives I know about.
A lot has happened in Jellyfin over the past year - it's been a bit bumpy until fairly recently but if you haven't checked it out recently it can be worth another go.
Once they complete the full migration to Entity Framework I think everything will fall in place.
The main issues I’ve faced with Jellyfin are chromecast streaming and the auto-organize plugin failing. I’ve been using it for 2 years now, and still very shaky.
For me, at least, Emby handled movies with non-English titles very poorly. I have a lot of those, so it was a lot of work getting those matched up correctly. At some point I realized that the fastest/best approach would be to check the Plex metadata, which matched the same movies up correctly and had the Chinese or Korean title for me, and use that to match up Emby. Saved a few steps, but I could save even more steps by abandoning Emby.
It's possible that it'll be harder in the future, but so far Plex still compares favorably to all alternatives I know about.