As someone who has a ton of handmade playlists, nothing hurts my soul more than updating list orders, realizing too late that you had something in the search bar, and watching as a playlist of thousands of songs becomes a playlist of five with no obvious way to undo.
I genuinely believe the playlist backup feature Musicbee has--in the form of exporting static copies--should be on by default. Even better would be giving playlists undo states but this should be easier to prevent than it is currently.