New Jellyfin Server/Web release: 10.9.10

[Efficient_Good_5784]

And even how an entry is stored within the XML/database by using the collection name and the title/sort title instead of the full item path in the event you choose to change the path for some reason. Instead when I upgrade a movie from one format to another I need to find that movie in all collections and, previously, manually update the XML files but now would need to re-add them to all collections they would be in.

It's not just collections. Everything in Jellyfin relies on the absolute path to the media files.
If the full absolute path changes for any of your media, Jellyfin will not be able to find it. It will instead treat the exact same file in the new path as a brand new file and just treat it as such.

Changing this behavior will be a very big undertaking.