It makes sense why Emby doesn't support playing blurays in a normal bluray manner, but its still a format many people like to archive their content in (i.e. keep it 1:1).  However, even without supporting blurays in a normal matter with menus and all, emby should be able to stream a bluray playlist as a single movie much like it streams and mkv or any other container format. Now, blurays contain lots of playlists (and some contain obfuscated playlists), so it wouldn't be the best ui experience