Both will happen.
🤞. Hopefully it's just JF getting better, of course, but that last app redesign on Plex was really rough. I had to downgrade the app to make it work well again.
Of course I can put extra work into formatting my subtitles to make them work everywhere. Sometimes they are embedded, sometimes they are an .srt file next to the video file. And I don't want to spend time normalizing all of them. It already just works all the time on Plex, so I'll simply wait until JF fixes the support.