YMMV of course but Jellyfin supports manual tagging well enough for my uses. No need to change filenames and break folder structures you set up for easier navigation in file browsers (as I did), you can click the "Identify" option on a file/folder and search your enabled databases by title or IMDB number. Once you tell it what TV show a folder is for, all the episodes seem to get automagically recognized. It's just that first step that doesn't happen by itself when the folders aren't named "correctly", and you could probably get around it by using Tiny Media Manager to mass-write NFO files (which Jellyfin recognizes).